GeoSciences

Fossil chambered nautilusThe GeoSciences activities group meets the second Thursday of the month from 6:30p.m. – 9p.m. in the Cafeteria (along the same hall as the Merrimac Room) in the Senior Center.  Meetings and field trips are open to all HGMS members.

Attendees are interested in geology, mineralogy, paleontology (fossils), and Indian artifacts, plus lapidary, jewelry and field trips.

The next meeting is May 9th.  Bill will present a program on conodonts.  This is just a sampling of the interesting information he’ll discuss!  Conodonts are almost microscopic fossils, dating back 540 million years and persisting through the Triassic before becoming extinct.  Come learn more about the tiny teeth you searched for on the May 4th trip to the Flint River!

ConodontConodonts’ development was rapid (geologically speaking), and they are found world-wide, whereby they serve as excellent index fossils, used to identify and date various geologic rock layers.  But what were they?  Fish?  Worms?  Something otherwise unknown?

Conodonts are the only body part – the teeth – that was preserved of what we now know to be tiny jawless fish, some only a quarter inch long.  The teeth were preserved because they are made of hydroxy-apatite, i.e. calcium phosphate, the same minerals that make up most animals’ teeth and bones.  In very recent years, body impressions were found in several locations around the world in very fine-grained silts.

 

 

Conodont tooth morphology