Oldest Rocks in MN Form

Volcanic Islands built out of ancient seas (Northern MN) – Formation of

Ely Greenstone

Algomen Orogeny

Stromatalites in MN Rock Formations

Penokean Orogeny

Mid-Continent Rift – creating N Shore volcanics

Last Glacial Advance Begins

Glacial Lake Agassiz Forms

Paleozoic Era Begins

Karst Topography and Cave Formation in SE MN

Glacial River Warren Begins to Flow

Seas Cover Southeastern MN in Intervals

Precambrian Era Begins

Mesozoic Era Begins

Cenozoic Era Begins

Pangea Forms

First Bacteria

Green Algae

Jellyfish

Trilobites

Spiders

Sharks

Ferns

Cockroaches

Earthworms

Aracheopteryx

First Flowering Plants

Tyrannosaurus

Grass

Mammoths

Pine Trees Dominate

Free O2 in the Atmosphere

Modern Humans

K-T Boundary

First Multi-Cellular Organisms

Banded Iron Formations – Mesabi Range

Burgess Shale

Mini Ice Age (Younger Dryas)