Extinction is Forever

Lake Michigan's Left Coast reveals Paleozoic limestone and dolomite dating to the Devonian Period (420–350 million years ago). Abundant in rocks from the Paleozoic are fossilized brachiopods, marine animals with upper and lower hard shells hinged at the rear. Though they first appear in rocks dating to the early Cambrian Period (540–485 million years ago), brachiopods reached... Continue Reading →


Pipe Organ Coral Fossil

From the beach at Lake Michigan's Left Coast Pipe organ coral fossil, probably from the Devonian Period (419.2–358.9 million years ago), by Left Coast Creative (© 2017 Elizabeth G Fagan) for the blog Lake Michigan's Left Coast More about Left Coast Creative services & the blog Lake Michigan's Left Coast

Lake Michigan at 20-Year High

The Devonian Period (419.2–358.9 million years ago) jawless fish Cardipeltis has been found in Utah and Wyoming. This fossil is from Lake Michigan's Left Coast in the Great Lakes region. Is it the jawless fish? A hunk of fossilized mud? Along this beach in southeastern Wisconsin, Lake Michigan has been eating away at beaches at... Continue Reading →

An Odd Little Creature 1

This rock is unusual on Lake Michigan's Left Coast. It appears to be an odd little creature. The limestone bedrock at here is Devonian in origin, having been laid down some 419.2 to 358.9 million years ago, so maybe it dates from that period. Directly to the north and south, bedrock is a little older,... Continue Reading →

Sandy, Irma, and Powerful Women

The Field Museum of Chicago is hosting an event to which one may bring fossil finds and enlist the help of experts with identification. I would like to go; more exactly, I'd like the experts to come to my house and tell me I am right. Alas. Field Museum of Chicago ID Day I have... Continue Reading →

Faces of Extinction 3

When mass extinctions occur, as they have five times previously in Earth's history, every member of a given species expires. Not just the old, the infirm, those who have a certain vulnerability. All members of the species die, even the babies. After spotting dozens of limestone skulls of extinct creatures on Lake Michigan's Left Coast,... Continue Reading →

Faces of Extinction 2

Over its 4.6 billion-year history, Earth has changed many times, in many ways. Homo sapiens, the name we give ourselves, evolved a few million years ago, a tiny point in time when Earth's conditions were just so. A peculiar trait of a certain subgroup of Homo sapiens, aka humans, put itself at the center of... Continue Reading →

Tiny Brachiopod Shards

Very small shards of brachiopod shells appear in this jumble of fossils set in sandstone. Also visible are coral fossils. Copyright, Disclaimer, Glossary, Bibliography

Faces of Extinction 1

As children we wondered, "Why don't we see living dinosaurs?" "Because they are extinct," a parent or teacher told us. And we learned that "extinct" is an adjective meaning "of a species, family, or other larger group having no living members." (oxforddictionaries.com) We might further learn such facts as: "Species become extinct for many reasons,... Continue Reading →

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