The 366 daily episodes in 2014 were chronological snapshots of earth history, beginning with the Precambrian in January and on to the Cenozoic in December. You can find them all in the index in the right sidebar. In 2015, the daily episodes for each month were assembled into monthly packages, and a few new episodes were posted. Now, the blog/podcast is on a weekly schedule with diverse topics, and the Facebook Page showcases photos on Mineral Monday and Fossil Friday. Thanks for your interest!
Thursday, June 19, 2014
June 19. Crinoids
Actinocrinites gibsoni, Montgomery Co., Indiana
Crinoids really thrived in the warm shallow Mississippian carbonate seas of central North America. At Crawfordsville, Indiana, there’s a lagerstatten – an assemblage of fossils that is remarkable in the completeness and preservation of the fossils. It has lots of crinoids, with the fine details of their arms and other structures remarkably well preserved. They lived about 340 million years ago, a time called the “Age of Crinoids,” at least in Indiana and much of the rest of the region covered by those seas. Crawfordsville crinoids are found in museums of paleontology around the world.
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