Stromatolites North of the Great Lakes lies the Canadian Shield, a very ancient geologic feature that bears Banded Iron Formation (BIF). Formed 4 to 2.5 billion years ago, BIF is among Earth’s oldest rock formations. […]
Category: Great Lake
“A Great Lake is an unpredictable neighbor,” says artist Elizabeth G Fagan. Fagan not only features Lake Michigan in her art, she is also an amateur geologist. “The Great Lakes region is a rock hound’s paradise.”
February @ Lake Michigan’s Left Coast
February @ Lake Michigan’s Left Coast The Great Lakes of North America contain 20 percent of the world’s fresh water. Seventy percent is locked in the ice of Antarctica. All other lakes and ponds and […]
The Teens Arrived on Tuesday
The Teens Arrived on Tuesday The teens arrived on Tuesday Then a deep dive To single digits German Shepherd In heart-gouging crouch Frozen pads, three nights in a row No beach walk for Rosie We […]
Precambrian Greenstone
Precambrian Greenstone The Canadian Shield constitutes the largest mass of exposed Precambrian rock on the face of the Earth. Extending into Minnesota and Wisconsin, the geological formation is a collage of rock categories. One type […]
Lake Michigan’s Rise & Fall
January Each of the Great Lakes has an annual rise and fall cycle driven by precipitation, snow melt, and evaporation. Evaporation rates vary with air and water temperatures. Annually, water levels follow a predictable pattern. […]
Extinction is Forever
Extinction is Forever The bedrock of the western coast of Lake Michigan (aka Lake Michigan’s Left Coast) is Paleozoic limestone and dolomite. It dates from the Devonian Period (420–350 million years ago). Abundant in rocks […]
Death on Lake Michigan’s Left Coast
Death on Lake Michigan’s Left Coast Among the Great Lakes, Lake Michigan is unique for its north-south configuration. In summer, southwesterly winds create invisible currents running parallel to sandy beaches that line the western shore. […]
Permian Amphibian
Permian Amphibian North America’s Great Lakes region was once the bed of an ancient sea. Fossils abound if one knows where and how to look. Paleozoic fossils of many periods regularly wash up on the […]
ELIZABETH G FAGAN 