Tag Archives: geologic

What’s a Graptolite?

Remember that Golden Spike? (Click here or scroll down one story.) It marks a boundary between two geologic time spans. In a nutshell, it’s where and when (geologically speaking) a  species makes its debut in the geologic record.
The Oklahoma spike is where Diplacanthograptus caudatus was found. It was a small aquatic animal called a Graptolite that floated around thanks to ocean currents.
Kyle Hartshorn with Dry Dredgers sent along some pictures of Graptolites that were found in Oklahoma. They’re tiny and look like pencil marks in the rock. Hartshorn told me, “Graptolites came in a variety of shapes: long and thin, short and wide, wishbone shaped, spiraled, and more.  There were quite a few forms at the places we went.”
Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

This pic below is of a conodont. It was an small creature that kind of looked like an eel. The conodont below is the yellow-orange speck inside the circle. That circle is about the size of a dime and was drawn around the fossil to help spot it. Conodonts are extremely hard to spot with the naked eye.

Courtesy: Kyle Hartshorn

Courtesy: Kyle Hartshorn

These images are why I can’t help but examine rocks when I’m outside. You never know what you’re going to find, fossils can be all shapes and sizes!!