NEW MEXICO GEOLOGICAL SOCIETY
Guidebookof the
MOGOLLON RIM REGIONEAST-CENTRAL ARIZONAPrepared in cooperation with the
ARIZONA GEOLOGICAL SOCIETYE d i t e d b y
Robert H. Weber and H. Wesley Peirce
T H I R T E E N T H F I E L D C O N F E R E N C E
October 18, 19, and 20, 1962
N E W M E X I C O G E O L O G I C A L S O C I E T Y e T H I R T E E N T H F I E L D C O N F E R E N C E 1
C O N T E N T S
President 's Message ------------------------------------------------------------------------------------------------------------------------------------------------------------------- 3
Acknowledgments ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 4
Executive and Field Conference Committees .................................................................................................................................................5
Publicat ions of the New Mexico Geological Society ------------------------------------------------------------------------------------------------------------------- 7
Schedule -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 7
Index Map and Conference Route ...................................................................................................................................................................... 8
ROAD LOGS
Gallup to Globe via Zuni, St. Johns, Show Low, and Salt River Canyon
First day, Thursday, October 18 ------------------------------------------------ Roy. W. Foster, Robert Ostrander, J. P. Akers, P. W.Johnson, M. E. Cooley, T. L. Finnell, E. J. McKay, H. Wesley Peirce, and George R. Roseveare 10
Globe to Superior and returnSecond day, Friday, October 19 ---------------------------------------------------------------- H. Wesley Peirce and George R. Roseveare 26
Globe to Flagstaff via Payson, Jerome, and SedonaThird day, Saturday, October 20 ------------------------------------------------------------------------------------H. Wesley Peirce, M. E. Cooley,
P. W. Johnson, and William J. Breed 31
Alternate route from mile 152.4 to Flagstaff via Black Canyon Highway ----------------------------------------------- W il l iam J. Breed 50
__________ 0 _________
Geologic Information Center
2 N E W M E X I C O G E O L O G I C A L S O C I E T Y < ? > T H I R T E E N T H F I E L D C O N F E R E N C E
PAPERSA working hypothesis for Arizona's older Precambrian history ------------------------------------------------------------------------ Gordon Gastil 52
Older Precambrian rocks near the Salt River Canyon, central Gila County, Arizona ---------------------------------- D. E. Livingston 55
New K-Ar dates for the Precambrian of Pinal, Gila, Yavapai, and CoconinoCounties, Arizona ------------------------------------------------------------------------- P. E. Damon, D. E. Livingston, and R. C. Erickson ------56
Regional structural-stratigraphic cross section, east -central Arizonato west- central New Mexico ------------------------------------------------------------------------------------------------------- Sherman A. Wengerd 58
The Deming axis, southeastern Arizona, New Mexico, and Trans -Pecos Texas -------------------------------------- Gregory L. Turner 59
Devonian conodonts in Arizona ------------------------------------------------------------------------------------------------------------------ Ray L. Ethington 72
Pennsylvanian rocks of the Mogollon Rim area, Arizona -------------------------------------------- F. E. Kottlowski and Kay C. Havenor 77b/ Paleontological reconnaissance of subsurface Pennsylvanian in southern
Apache and Navajo Counties, Arizona ---------------------------------------------------------------------------------------------- Donald H. Lokke 84
Lithology and stratigraphy of the Supai Formation, Fort Apache Indian Reservation, Arizona ------------- Stephen S. Winters 87
Occurrences of Paleozoic carbonaceous deposits in the Mogo l l on Rim region ------------------------------------- D. 0 . McGoon, Jr. 89
Note on the " A l p h a " member of the Kaibab Formation --------------------------------------------------------------------------------------- L. F. Brady 92
Cretaceous rocks of the Mogollon Rim area in Arizona ------------------------------------------------------------------------ Halsey W. Mil ler, Jr. ------93
Cenozoic history of the Jerome region, Yavapai County, Arizona ------------------------------------------------------------- Robert E. Lehner 94
Cenozoic sedimentary rocks of Tonto Basin --------------------------------------------- J. F. Lance, J. S. Downey, and Malcolm Al ford ------98
Mogollon Rim volcanism and geochronology ------------------------------------------------------------------------------------------------------- Bruno E. Sabels 100
The signif icance of the volcanic rocks in the Fossil Creek area, Arizona -------------------------------------------------------Floyd R. Twenter 107
New fossi l locali t ies in the Verde Formation, Verde Val ley, Arizona --------------------------------------------------------------- Floyd R. Twenter 109
Pollen analysis of Laguna Salada --------------------------------------------------------------------------------------------------------------------------------- R. H. Hevly 115
The Holbrook anticline, Navajo County, Arizona ------------------------------------------------------------------------------------------------------ Carl W. Bahr 118
Geology along the Diamond Rim and adjoining areas, Gi la and Navajo Counties, Arizona -------------------------- Spencer R. Titley 123
Springs along the Mogollon Rim in Arizona ------------------------------------------------------------------------------------------ J. H. Feth and J. D. Hem 129
Rocks and water in Verde Valley, Arizona ---------------------------------------------------------------------------------------------------------- Floyd R. Twenter 135
Hydrologic aspects of the pinyon and juniper eradication project on the Fort ApacheReservat ion, Arizona ----------------------------------------------------------------------------------- R. M. Myrick and M. R. Collings 140
Geology of Kennecott Copper Corporat ion's Safford copper deposit ……………………………… Annan Cook and R. F. Robinson 143
Some geologic features of the Superior area, Pinal County, Arizona……………. F. Hammer, R. N. Webster, and D. C. Lamb 148
Geological notes on the Miami-Inspirat ion mine ---------------------------------------------------------------------- E. F. Reed and W. W. Sammons 153
Geology and ore deposits of the Globe quadrangle ------------------------------------------------------------------------------------------ Nels P. Peterson 1 5 8
Z u n i i n b r i e f r e v i e w ------------------------------------------------------------------------------------------------------------- Bertha P. Dutton 162
Archeology of the Flagstaff area ------------------------------------------------------------------------------------------- Harold S. Colton 171
Abstracts of technical papers ------------------------------------------------------------------------------------------------------------------------------------------------------- 173
IN POCKET
Areal geologic map of Holbrook antic l ine -------------------------------------------------------------------------------------------------------------------------- Carl W. Bahr
Drainage map of Holbrook ant ic line ----------------------------------------------------------------------------------------------------------------------------- Carl W. Bahr
General ized geologic map and sections of the Superior area -------------------------------------------------------- D. F. Hammer and R. N. Webster
Geology of Magma vein ---------------------------------------------------------------------------------------------------------------- D. F. Hammer and R. N. Webster
Regional structural-stratigraphic section ------------------------------------------------------------------------------------------------------------ Sherman A. Wengerd
N E W M E X I C O G E O L O G I C A L S O C I E T Y % T H I R T E E N T H F I E L D C O N F E R E N C E 3
PRESIDENT'S MESSAGE
W elcome to the Thi r teenth Annual F ie ld Conferenceo f t h e N e w Me x i c o G e o l o g i c a l S o c i e t y i n t h e Mo g o l l o nRim country of Ar izona. This is our second conference tobe he ld in cooperat ion wi th the Ar izona Geolog ica l Soc i-e ty , and the road logs and techn ica l papers in th isgu idebook s hed l i gh t on m any prob lem s wh ic h a re o fm u t ua l in teres t to geo log is ts in both s ta tes . The h is toryof cooperat ion between the s is ter soc ie t ies , as wel l asbetween Ar izona and New Mexico geo log is ts in genera l ,he lps to account for the fac t that there are no "s ta te-l ine fau l t s " wi th "d isp lacements " la rge enough to rea l l yseparate the rocks or the geologists.
A f ter rev iewing pres ident ia l messages in the preced-ing guidebooks, I f ind i t d i f f icul t to avoid repet i t ion in thismessage. The reasons are obv ious : so many th ings havebeen wel l said by past pres idents , and so many things arewor th repeat ing. The Mogol lon Rim conference wasconce ived severa l years ago and was pred ic ted in thepres ident ia l messages by Frank Kot t lowsk i and RichardHol t in the gu idebooks for the 11th and 1 2th f ie ldconferences . These men and others in both soc iet ies ,who are respons ib l e f o r c onc e i v i ng and c a r ry i ng ou tt h i s and o t he r f i e l d conferences , are not "prophets " inthe usua l sense but , i n s t e a d , a r e p e o p l e w i t h ac a p a c i t y f o r h a r d wo r k wh o unsel f ishly give thei r t ime,ideas, and profess ional knowl edge in o rde r t ha tp red i c t i ons wi l l c om e t rue . I t i s g ra t if y ing to note thato thers who are not a f f i l i a ted wi th e i ther soc ie ty a lsocont r ibu te great ly . Unt i l one has worked on a f i e l d t r i pand obs erved a t f i r s t hand t he p lann ing and exec u t i ono f t he t r i p and pub l i c a t i on o f t he gu idebook , i t i sd i f f i cu l t to rea l i ze the complexi t ies invo lved, and ap-p r e c i a t e t h e t a l e n t s a n d h a r d wo r k o f t h e m e m b e r s o ff i e l d t r i p c o m mi t t e e s . A l a r g e d e b t o f g r a t i t u d e i s d u et he Genera l Cha i rm an and V ic e- Cha i rm an , t he E d i t o rs ,the cha i rmen and members of the var ious commi t tes , theauthors of the ar t i c les , and the companies and State andFedera l organ izat ions that donated "company t ime" andserv ices . I hope that everyone who uses th is gu idebookwi l l read the l i s t o f commi t tees in the f ront o f thegu idebook and determ ine the names and af f i l i a t ions ofthose who made the field conference possible.
The Mogol lon- Tonto Rim f ie ld conference again em -phas i zes t he non- s pec ia l i zed purpos es o f t he NewMexi c o G e o l o g i c a l S o c i e t y . T h e r o u t e o f t h e f i e l d t r i pwa s chosen to cover the general geology of the ent i reregion. The s ec ond day ' s t r i p i n t he G lobe- S uper i o ra rea t ak es us into the heart of one of the famous metalmining areas of Ar izona and should prove of in teres t toa segment o f the profession which is often neglected.
The guidebooks of the New Mexico Geological Societynow f o rm an unbrok en s e r i es o f t h i r t een . The 1s t , 2nd ,3rd , and 6th gu idebooks are out o f pr in t , and the s tocksof several others are low. Thousands of guidebooks havebeen sold, the sale of these books providing a cont inuings i n g l e s o u r c e o f r e v e n u e f o r t h e s o c i e t y . H o we v e r , wepres en t l y have an inven t o ry o f abou t $40 , 000 wor t h o fguidebooks. These books are all paid for, but the incomefrom theirsale is near ly s tat ic , whereas, the pr ice of pub l i s h i n g
n e w g u i d e b o o k s h a s s l o w l y r i s e n . I n 1 9 6 1 , t h e c os tand inc om e c urves "c ros s ed" and t he p r i c e o f pub-l i ca t ion exceeded the income to the Soc ie ty . In sp i te ofec onom ies in t he p repara t i on o f t he 13 t h gu idebook we
m a y f i n d o u r s e l v e s i n a s i m i l a r p o s i t i o n i n 1 9 6 2 . T h i srat t les an old skeleton in the Society 's c loset ; should thef ie ld conferences and elaborate guidebooks be cont inuedas in the past , or should the Society change i ts approachto both the conferences and the gu idebooks? This ques-tion has been raised and discussed by the membership ons e v e r a l o c c a s i o n s . V e r y f e w p e o p l e r e a l l y w a n t e d t ochange the mainly s at is factory operat ions of the Society,and i t has a lways been dec ided overwhelm ing ly that wes h o u l d c o n t i n u e w i t h t h e s t a t u s q u o . H o w e v e r , t h ef i nanc ial s i tuat ion has become cri t ical th is year and areal istic approach is necessary.
Severa l so lu t ions have been sugges ted. A l l o f themhave mer i t , bu t a l l o f them have cer ta in d isadvantages .An obvious solut ion is to sel l our back inventory of guide-b o o k s . T h i s i s e a s i e r s a i d t h a n d o n e . W e m u s t a d m i tthat the market for these books is somewhat l im i ted.Undoub ted ly mos t o f them wi l l be so ld eventua l l y , but i ti s d i f f i c u l t t o ac c e le ra t e t he dem and . The Exec u t i veComm i t t ee began an adver t i s i ng c am pa ign in 1961 andt h i s is be ing cont inued. The campaign he lped but , i twi l l no t so lve a l l o f our f i sca l prob lems unless theaud ience for wh o m t h e g u i d e b o o k s a r e p u b l i s h e d h a sa c h a n g e o f h e a r t , o r a t l e a s t a c h a n g e o f f i n a n c i a ls t a t u s . A r ela ted, par t ia l so lu t ion is to l im i t the s ize ofthe ed i t ions , and th is has been done wi th the presentgu idebook . How ever, there are certain bas ic costs inpubl ishing an elaborate guidebook whether the edi t ion is500, 1000, or more; l im i t i ng t he num ber o f book sp r i n t ed i s by no m eans a total solution to publication costs.
I t has been suggested that we postpone our next f ieldconference for one or two years and recuperate f inanc ial-ly. This suggest ion has not met wi th much favor. Anothersuggest ion is that we sponsor several smal l t r ips by localgroups each year , but th is seems to in f r inge on the func-tions of the local societies.
A sugges t ion which has mer i t i s that our fu ture f ie ldconferences shou ld concent ra te on spec i f i c prob lems inl im i ted areas rather than at tempt ing to cover the geologyo f l a r g e r e g i o n s . A n " o u t c r o p " t r i p w o u l d c o n s i s t o fv i s i t i n g a n d e xa m i n i n g i n d e t a i l t h o s e l o c a l i t i e s wh i c hprov ide impor tant ev idence used in in terpre t ing reg iona lgeo logy. The loca l i t ies would inc lude such th ings ason -laps and angular unconformi t ies , wel l -exposed faul ts ,b ioherms, mineralized areas, important stratigraphiclocalit ies, e t c . T h is k i n d o f f i e l d c o n f e r e n c e wo u l ds a t i s f y t h e r em a r k o f t e n h e a r d o n f i e l d t r i p s , t o w i t : " Iw i s h I c o u l d see the 's ign i f i cant ' ou tc rops in those h i l l s5 m i les away
that he 's desc r ib ing. " An outc rop t r ip probab ly cou ld bep l a n n e d i n s u c h a wa y t h a t a m o d e s t a n d i n e xp e n s i v eguidebook could be prepared, the trip would be interest ing,f inanc ia l l y success fu l , and the complex work of thevar i -
ous commi t tees cou ld be l igh tened. Cer ta in ly , such t r ipswi l l be very much in order wi th in a very few years un lesswe are t o re -run s om e o f ou r ea r l i e r t r i ps . Re - runs m ayno t be des i rab le bec aus e in s om e areas ve ry l i t t l e newwork has been done, whi le in other areas other soc ie t ieshave he ld recent f ie ld conferences and publ i shedgu idebooks.
In d iscuss ing some of the prob lems of fu ture opera-t i o n s o f t h e S o c i e t y , I d o n o t i n t e n d t o b e p e s s i m i s t i c .The Soc ie ty has done an exce l len t job of prov id ing va lu-able informat ion to many geologis ts and br inging togetherrepresentat ives of al l the disc ip l ines of the geologicalsc iences . The cont inu ing need for the serv ices of theSoc ie t y , and t he v igo r , w i l l i ngnes s and in i t i a t i ve o f i t sm embers guarantees i t s fu ture success . However , nowseems t o b e a g o o d t i m e f o r s o m e r e f l e c t i o n o n t h e
f i n a n c i a l p r o b l e m s o f t h e o r g a n i z a t i o n a n d t h e f u t u r ec o u r s e o f i t s c . , i i v i t i es . Change i s i nev i t ab le i n t hec ours e o f geo logical societies as in other human activit ies.The Executive Commi t tee wi l l be engaged shor t l y inprepar ing for some of next year ' s ac t i v i t ies — theseth ings take t ime — and wi l l have to make decis ionsabout a f ie ld conference. The o f f i c e rs o f t he Soc ie t ya t t em pt t o ac t i n ac c o rd wi t h t he wishes of themembersh ip a nd your thought fu l comments are invited.
I n t he m ean t im e , I am s ure we wi l l en joy t he s pec -tacular scenery and the geology of the Mogol lon Rim, andwi t h ou r hos t s , t he A r i zona Geo log i c a l Soc ie t y , we wi l lcount this as one of our memorable field conferences.
Elmer H. Boltz, PresidentNew Mexico Geolog ica l Soc ie ty
ACKNOWLEDGMENTS
O n c e a g a i n , a s f o r t h e N i n t h F i e l d C o n f e r e n c e i n1958, we are indebted to our Ar izona col leagues for thei rs p lend id c oopera t i on in p repa r i ng an in f o rm a t i vegu ideb o o k a n d c o n d u c t i n g a n e xc u r s i o n t h r o u g h o n eo f t h e more scen ic and geolog ica l l y s ign i f i cant reg ionsof the i r domain . Members and f r iends of the Ar izonaGeolog ica l Soc ie t y have c on t r i bu t ed uns t i n t i ng l y o ft he i r t im e and ta lents toward the success of th is f ie ldconference. The measure of thei r contr ibut ion is onlypart ia l ly revealed by the committee memberships andtechnical contributors l ist ed in the pages following.
A perusal of this guidebook perhaps more fully revealst he b road s pec t rum of o rgan i za t i ona l a f f i l i a t i ons o f t hecommi t tee members and authors , represent ing manysegments of governmenta l , commerc ia l , and academicf ie lds o f ac t i v i t y . The New Mexi c o Geo log i c a l S oc ie t yi s m os t gra te fu l , bo th to the ind iv idua ls so ident i f ied ,and the or gan izat ions that they represent , fo r the manyman -days that were devoted to the preparat ion for , andconduc t o f , th is f ie ld conference. W i th in many of these
organ izat ions are a number of persons who contr ibuteds i gni f icant ly, but anonym ous l y , t o t he s uc c es s o f t h i sp rog ram . A l t hough espec ia l l y notewor thy are the s ta f f so f the Ground W ater Branch of the U. S. Geolog ica lSurvey, the New Mexico Bureau of Mines and MineralResources, and the Arizona Bureau of Mines, ot hersshare in our appreciat ion of these efforts even though notindividually identified herein.
To t he m anagem en t and s t a f f o f t he Miam i CopperCompany Div is ion of the Tennessee Copper Corpora t ion ,t he I ns p i ra t i on Cons o l i da t ed Copper Com pany , and t hePhelps Dodge Corporat ion, the Society extends its sincerethanks for cour tes ies rendered dur ing s tops at the i rrespective mining properties.
Escor t serv ices prov ided by the New Mexico StatePol ice, the Ar izona Highway Pat ro l , and the Miam i Ci tyPolice greatly assisted the progress of the caravan.
4 N E W M E X I C O G E O L O G I C A L S O C I E T Y % T H I R T E E N T H F I E L D C O N F E R E N C E
N E W M E X I C O G E O L O G I C A L S O C I E T Y < > T H I R T E E N T H F I E L D C O N F E R E N C E 5
EXECUTIVE COMMITTEE — NEW MEXICO GEOLOGICAL SOCIETYElmer H. Boltz President U. S. Geological SurveyFrederick J. Kuellmer Vice- President New Mexico Bureau of
Mines and Mineral ResourcesSam Thompson Il l Secretary Humble Oil and Refining CompanyW o l f gang E. Elston Treasurer University of New MexicoRichard D. Holt Past President Humble Oil and Refining Company
EXECUTIVE COMMITTEE — ARIZONA GEOLOGICAL SOCIETYF. D. MacKenzie President Banner Mining CompanyT. W. Mitcham Vice- President University of ArizonaC. L. Fair Secretary Bear Creek Mining CompanyS. V. Bowditch Treasurer American Smelting and Refining Company
FIELD CONFERENCE COMMITTEESWilliam R. Speer General Chairman El Paso Natural Gas Products CompanyRobert L. Cushman Vice- Chairman U. S. Geological Survey
Guidebook CommitteeRobert H. Weber Editor New Mexico Bureau o f Mines
and Mineral ResourcesH. Wesley Peirce Co -Editor Arizona Bureau of Mines
Road Logging CommitteePhill ip W. JohnsonJay P. AkersSidney R. AshWill iam J. BreedMaurice E. CooleyThomas L. FinnellRoy W. Foster
E. J. McKayRobert E. OstranderH. Wesley PeirceGeorge R. RoseveareAndrew F. Shride
Chairman U. S. Geological Survey U. S.Geological Survey U. S.Geological Survey Museum ofNorthern Arizona U. S.Geological Survey U. S.Geological SurveyNew Mexico Bureau of Mines
and Mineral ResourcesU. S. Geological SurveyMobil Oil Company ArizonaBureau of Mines ArizonaBureau of Mines U. S.Geological Survey
Registration CommitteeC h a i r m a n P a n A m e r i c a n P e t r o l e u m C o r p o r a t i o n
Pan American Petroleum Corporat ionPan American Petroleum Corporation
Caravan CommitteeChairman New Mexico Bureau of Mines
and Mineral Resources
Catering Committee
Robert M. ByingtonGeorge AndersonRoss Lessentine
Roy W. Foster
Chairman Arizona State UniversityCharles Evensen
Advertising CommitteeRoy L. Pritchard Chairman El Paso Natural Gas Co.
James L. Albright Pubco Petroleum CorporationRichard D. Holt Humble Oi l and Ref in ing Co.Frederick J. Kuellmer New Mexi c o Bureau o f Mines
and Mineral ResourcesReed Welch American Smelting and Refining Company
Publicity CommitteeDave M. Thomas Chairman Consultant
Finance CommitteeWolfgang E. Elston Chairman University of New Mexico
6 N E W M E X I C O G E O L O G I C A L S O C I E T Y < > T H I R T E E N T H F I E L D C O N F E R E N C E
NEW MEXICO GEOLOGICAL SOCIETY 0' THIRTEENTH FIELD CONFERENCE 7
PUBLICATIONS OF THE NEW MEXICO GEOLOGICAL SOCIETY1. Guidebook of the San Juan Basin [covering north
and east sides], New Mexico and Colorado; FirstField Conference, 1950; edited by Vincent C. Kelleyand others; 153 pages, 40 illustrations. (Out ofprint)
2. Guidebook of the south and west sides of the SanJuan Basin, New Mexico and Arizona; Second FieldConference, 1951; edited by Clay T. Smith and Cas-well Silver; 163 pages, 69 illustrations. (Out of print)
3. Guidebook of the Rio Grande country, central NewMexico; Third Field Conference, 1952; edited by RossB. Johnson and Charles B. Read; 126 pages, 51illustrations. (Out of print)
4. Guidebook of southwestern New Mexico; Fourth FieldConference, 1953; edited by Frank E. Kottlowski andothers; 165 pages, 67 illustrations. $5.00
5. Guidebook of southeastern New Mexico; Fifth FieldConference, 1954; edited by T. F. Stipp; 213 pages,83 illustrations. $5.00
6. Guidebook of south-central New Mexico; Sixth FieldConference, 1955; edited by J. Paul Fitzsimmons; 193pages, 70 illustrations. Prepared with the coopera-tion of the Roswell Geological Society. $7.00 (Outof print)
7. Guidebook of southeastern Sangre de Cristo Moun-tains, New Mexico; Seventh Field Conference, 1956;Edited by A. Rosenzweig; 154 pages, 61 illustra-tions. $7.00
8. Guidebook of southwestern San Juan Mountains,Colorado; Eighth Field Conference, 1957; edited byFrank E. Kottlowski and Brewster Baldwin; 258 pages,109 illustrations. $7.00
9. Guidebook of the Black Mesa Basin, northeasternArizona; Ninth Field Conference, 1958; edited byRoger Y. Anderson and John W. Harshbarger; 205pages, 105 illustrations. Prepared in cooperationwith the Arizona Geological Society. $8.50
10. Guidebook of west-central New Mexico; Tenth FieldConference, 1959; edited by James E. Weir, Jr. andElmer H. Boltz; 162 pages, 83 illustrations. $8.50
11. Guidebook of Rio Chama country [New Mexico andColorado]; Eleventh Field Conference, 1960; editedby Edward C. Beaumont and Charles B. Read; 129pages, 35 illustrations. $8.50
12. Guidebook of the Albuquerque country [New Mex-ico]; Twelfth Field Conference, 1961; edited by Stu-art A. Northrop; 199 pages, 73 illustrations. $9.50
13. Guidebook of the Mogollon Rim region, east-centralArizona; Thirteenth Field Conference, 1962; editedby Robert FL Weber and H. Wesley Peirce. $9.50
These publications are available by mail (please add 25cfor postage and handling) from the New Mexico Bureauof Mines and Mineral Resources, Campus Station, Socorro,New Mexico. Also over-the-counter sales at either theBureau of Mines or the Department of Geology, Universityof New Mexico, Albuquerque. Checks should be madepayable to the New Mexico Geological Society. Geologicmaps are available by mail or over the counter at theBureau of Mines, Socorro, as follows:
(a) Geologic highway map of New Mexico; compiledby Frank E. Kottlowski and others. $1.25 folded;$1.50 rolled. Also available from the Departmentof Geology, University of New Mexico, Albuquer-que.
( b) Geologic map of the Sierra County Region, NewMexico; compiled by Vincent C. Kelley; accom-panies Guidebook of the Sixth Field Conference.$1.00
(c) Geologic map of the Rio Chama country; compiledby Clay T. Smith and William R. Muehlberger;accompanies Guidebook of the Eleventh FieldConference. $0.50
(d) Geologic map of the Albuquerque country; com-piled by Stuart A. Northrop and Arlette Hill; ac-companies Guidebook of the Twelfth Field Con-ference. $0.50
(e) Entry and exit road logs to supplement Guidebookof the Ninth Field Conference. $0.50 to $0.75
0
SCHEDULERegistration at the El Rancho Hotel, Gallup, New Mexico.
Late registration at the El Rancho Hotel.Caravan assembles at mile point 0.5 on New Mexico Highway 32, at the southside of town.
Caravan assembles 3.6 miles west of the Globe Court House in the parking lot nextto the bowling alley associated with the Copper Hills Motel, on the left side ofU. S. Highway 60-70.
Caravan assembles on Arizona Highway 88 in front of the Cobre Valley CountryClub, just north of the junction of Arizona 88 and U. S. 60-70, on the right shoulder.Field Conference ends at Flagstaff.
Wednesday, October 175:00 - 10:00 p.m.
Thursday, October 18Gallup, New Mexico toGlobe, Arizona.
7:00 a.m.
Friday, October 19Globe to Superior, Arizonaand return.
8:00 a.m.
Saturday, October 20Globe to Flagstaff, Arizona
7:00 a.m.
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EXPLANATION
FIRST DAY ROUTE/////
SECOND DAY ROUTE4 4 4
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10 NEW MEXICO GEOLOGICAL SOCIETY % THIRTEENTH FIELD CONFERENCE
ROAD LOG FROM GALLUP, NEW MEXICOTO GLOBE, ARIZONA
FIRST DAY — OCTOBER 18, 1962
Gallup to Zuni, New Mexico by Roy W. Foster and Robert Ostrander
Zuni, New Mexico to Show Low, Arizona by J. P. Akers, P. W. Johnson, and M. E. Cooley
Show Low, Arizona to Becker Butte on North Rim Salt River Canyon by T. L. Finnell and E. J. McKay
Becker Butte to Globe, Arizona by H. Wesley Peirce and George R. Roseveare, with comments by A. F. Shride
Distance of Travel: 236.5 miles.Starting Time: 7:00 a.m.Assembly Point: Mileage point 0.5, State Road 32, south side of town. (Fig. 1 shows route of trip.)
RESUMEThe first day of our trip takes us southward and west-
ward from Gallup, New Mexico into Arizona and theMogollon Rim country. As we travel toward the Rim, wewill see Cretaceous and younger rocks that have beendeposited on the beveled surfaces of progressively olderrocks. We will drive through the northwestern edge ofthe Datil volcanic field and will be able to trace some ofthe ancient drainage channels of the Little Colorado River,down which the lava flowed, by the erosional remnants.
The Rim marks the boundary between the ColoradoPlateau Province and the Central Mountains Province. TheCentral Mountains Province is the transitional zone be-tween the Plateau and the Basin and Range Province tothe southwest. South of the Rim we descend rapidly fromthe Plateau through the complete section of Mesozoic andPaleozoic rocks. In the sequence in Salt River Canyon,the Paleozoic and younger Precambrian rocks have beenintruded by diabase.
Note:—Users of the road log should bear in mind that the cumulative mileages are approximate. Variations can beexpected due to differences in individual odometers and errors on the part of those preparing the log. Check pointssuch as bridges and road intersections in the log permit ready correction.
CumulativeMileage
0.0 Junction Third Street (State Road 32) and Coal Avenue (U.S. 66) . GO SOUTH ON THIRD STREET.0.1
0.1 TURN LEFT onto Aztec.0.1
0.2 TURN RIGHT onto Second Street (State Road 32).0.2
0.4 Gallup Sandstone crops out on right.0.1
0.5 Outcrops of sandstone, shale, and coal in the Crevasse Canyon Formation on both sides of road. ASSEM-BLY POINT. Rear of caravan at this mileage.
2.02.5 Cattle guard.
0.12.6 Coal seam in the Crevasse Canyon Formation at 3:00 (read "three o'clock").
0.43.0 Lenticular sandstone overlying thin coal bed and shale in Crevasse Canyon Formation.
0.43.4 Cattle guard. Outcrops to the right on hill are in the Menefee Formation. Road continues through out-
crops of sandstone, shale, and thin coal beds in the Crevasse Canyon Formation. Note the lenticular na-ture of the sandstones in this interval.
2.86.2 Bridge.
0.26.4 Bridge.
1.27.6 Road cuts and outcrops on both sides of road of Menefee Formation.
0.8
8.4 Sandstone, shale, and thin coal beds in the Menefee Formation.
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