Birdbear Formation (Late Devonian)of North Dakota
A Core AtlasJeffrey W. Bader
GEOLOGIC INVESTIGATION NO. 226NORTH DAKOTA GEOLOGICAL SURVEYEdward C. Murphy, State GeologistLynn D. Helms, Director Dept. of Mineral Resources2019
A
B
C
B
D
Cycle 1(part)
Cycle 2(part)
A
C
B
D
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
medium dark gray
dark gray
dark greenish gray
yellowish gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core - 9 ft = Log
Table of Contents
Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2NDIC No. 207 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3NDIC No. 793 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4NDIC No. 2967 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5NDIC No. 5921 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6NDIC No. 6642 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7NDIC No. 9045 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8NDIC No. 10776 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9NDIC No. 11434 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10NDIC No. 12249 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11NDIC No. 12962 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12NDIC No. 13698 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13NDIC No. 15412 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14NDIC No. 21139 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15NDIC No. 24456 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16NDIC No. 25688 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17NDIC No. 26582 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figures
Figure 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
i
This document presents detailed lithologic descriptions from 16 select Birdbear Formation rock cores across the state of North Dakota (Fig. 1). Cores were viewed and described at the Wilson M. Laird Core Library from February to August 2019, and during August 2018. Core profiles including: 1) Well information; 2) log responses for gamma-ray, resistivity, neutron porosity, and density porosity; 3) detailed lithology graphic with generalized description; 4) sequence stratigraphic graphic showing interpreted shallowing-upwards cycles; and 5) core photographs, are presented. Printing on 11x17 is recommended for optimal graphics.
Explanation
McKenzie
Williams
Divide
Mountrail
North Dakota
MapArea
BurkeRenville
BottineauRolette
McHenryWard
Golden Valley
Billings
Dunn
Slope
Bowman
Towner
Pierce
Benson
McLean
Mercer
Sheridan
Oliver
Morton
Hettinger
Adams
Wells
StutsmanKidderBurleigh
GrantEmmons
Logan
McIntosh
Sioux
Figure 1.
Stark
15 mi0
120 24 km
207
793
21139
26582
15412
12249
12962
10776
24456
256885921
2967
6642
13698
11434
9045
793 Well Location with NDIC number
1
Anhydrite
Dolostone
Limestone
Shale
Claystone
Mudstone
Siltstone
Amphipora
Anhydritic
Anhydrite-Bladed
Anhydrite-Nodular
Brachiopod
Brecciated/Disrupted Bedding
Burrow
Carbonaceous
Cemented Fracture
Coral
Cross Laminated
Dolomitic
Fossil
Gastropod
Intraclast
Ostracod
Pelloid
Ripple Lamination
Rugose Coral
Skeletal Material
Stromatoporoid
Stylolite
Burrow Mottled
Undulatory Bedding
Vuggy Porosity
Wavy Bedding
Legend
DD Duperow Formation
DTF Three Forks Formation
LS Lower Shale (Bakken)
LTF Lower Three Forks
MM Middle Member (Bakken)
UD Upper Devonian2
A
B
C
Gamma Ray
A
B
C
Original
Original
Jeffrey W. Bader
pale pink to pale reddish purple
brownish black
yellowish gray
dusky red to greenish gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 85 ft = Log
3
Cycle 1(part)
Cycle 3
Cycle 4
D
B
C
A
Cycle 2
Gamma Ray
D
C
B
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
A
-102.313085
Original
Original
Jeffrey W. Bader
medium bluish gray
pale yellowish brown to pinkish gray
pinkish gray to medium dark grayolive gray
medium bluish gray
very pale orangebrownish black
light bluish gray to light olive gray
dusky yellowish brown
olive gray
Core = Log
4
Cycle 1(part)
A
B
C
Cycle 2(part)
Resistivity
Gamma Ray
A
B
C
Original
Original
Jeffrey W. Bader
pale yellowish brownbrownish black
medium dark gray
brownish gray to greenish gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 5 ft = Log
5
A
B
C
B
D
Cycle 1(part)
Cycle 2(part)
A
C
B
D
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
medium dark gray
dark gray
dark greenish gray
yellowish gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core - 9 ft = Log
6
Cycle 1(part)
Cycle 3
Cycle 4(part)
C
B
D
A
Cycle 2
-
D
C
B
A
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
dark greenish gray
medium gray to very light gray
pale yellowish brown
light bluish gray to medium dark gray
grayish black to greenish gray
light olive gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 13 ft = Log
7
Cycle 1(part)
Cycle 3(part) A
B
Cycle 2
B
A
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
very pale orange to paleyellowish brown
greenish gray to medium bluish gray
very pale orange
dark yellowish brown
dusky yellow
grayish yellow
pinkish gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core - 5 ft = Log
8
Cycle 1(part)
B
A
A
B
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
dark greenish gray
dark gray
Core + 1 ft = Log
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
9
Cycle 1(part)
Cycle 3
Cycle 4(part)
Cycle 2
A
C
B
A
C
B
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
dark yellowish brown
very pale orange to dusky yellowish brown
medium bluish gray to medium light gray
very pale orange to darkyellowish brown
dusky yellow
grayish green
pinkish gray
grayish green
pale yellowish brown
pale yellowish brown
pink to black
Core + 4 ft = Log
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
10
A
B
C
E
D
Cycle 1(part)
Cycle 2
Cycle 3
Cycle 4(part)
A
BC
D
E
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
MOI #
47.472273 -103.707705
Original
Original
Jeffrey W. Bader
brownish black
very light gray to olive gray
light olive brown
light bluish gray
brownish black
greenish gray to light gray
olive black
dark yellowish brown
brownish gray
Core + 4 ft = Log
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
11
D
C
B
A
Cycle 1(part)
Cycle 2
Cycle 3
A
BC
D
10960
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
-
BN SWSE Sec. 35, T148N, R102W
13465
Original
Original
Jeffrey W. Bader
greenish black
dark yellowish brown
bluish whitepale yellowish browngreenish black
bluish white
olive black
Core -10 ft = Log
12
Cycle 1(part)
Cycle 3
Cycle 4(part)
Cycle 2
A
B
C
D
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
-
SESW Sec. 18, T163N, R95W
AB
C
D
Original
Original
Jeffrey W. Bader
very light gray to light graydusky brown
medium gray to medium light gray
greenish gray
grayish orange
dusky yellow to brownish black
light olive gray
medium dark gray
yellowish gray
brownish gray to olive gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core - 2.5 ft = Log
13
D
C
B
A
Cycle 2
Cycle 3(part)
Cycle 1(part)
A
B
C
D
10740
10750
47.234713 -103.739459
18368
Beaver Creek
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
bluish white to light bluish gray
bluish white to light bluish gray
dark yellowish brown
light olive gray
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 17 ft = Log
14
Cycle 1(part)
A
B
C
D
B
A
C
D
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
-
Chesapeake Operating, Inc.
NENE Sec. 30, T138N, R95WOriginal
Original
Jeffrey W. Bader
dark reddish brown
dark yellowish green
olive gray
yellowish gray to grayish olive
brownish black
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 1 ft = Log
15
Cycle 1
Cycle 3
Cycle 4
Cycle 5(part)
B
A
C
D
E
Cycle 2
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
A
B
C
D
E
47.544396 -102.889294
Original
Original
Jeffrey W. Bader
greenish black
white to medium bluish gray
yellowish brown
medium bluish gray
greenish black
greenish gray to light bluish gray
light olive gray
medium dark gray
Core + 14 ft = Log
16
C
A
B
D
Cycle 1(part)
Cycle 4
Cycle 5
Cycle 3
Cycle 2
AB
C
D
577 1297Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
medium dark gray to very light graypale yellowish brown
olive gray
olive gray
olive gray
olive black
grayish orange pink
dark gray
grayish olive
olive gray
dusky yellowish brown
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Core + 19 ft = Log
17
C
B
D
A
NO
RTH DAKOT
A
GE
OLOGICAL S
URV
EY
1895
Cycle 1
Cycle 2
C
D
B
A
2837
47.005852 -103.827503Neutron Porosity
Density Porosity
Resistivity
Gamma Ray
Original
Original
Jeffrey W. Bader
grayish pink to very light gray
pinkish gray
pinkish gray to medium graydolomitic and
pinkish gray to medium gray
light olive graylight olive gray
medium bluish gray
medium bluish gray
Core - 13 ft = Log
18