Jen here –
This past weekend several students, myself, and my lab mate Maggie went to a fossil locality near Hopkinsville, Kentucky. This rock is from the Mississippian and this locality is particularly interesting to me because of the amount of blastoids you can find in a single moment. They are falling right out of the rock! So we went with a specific question to answer. We are looking to better understand the gap in fossil preservation within some of the blastoids there. Let me explain some – there are specimens that range from 0.25 – 15 mm in height. But most scientists ignore everything below 5 mm because it falls apart more easily than the larger specimens.
Recently we have examined some of the very tiny (0.25 mm) specimens and we are interested to see how the growth of the organism may be affecting its ability to preserve in the rock record! So we did some surface collecting – looking around on the ground and picking up specimens that we can see with our eyes. We also did a lot of bulk collecting. By bulk collecting I mean we filled buckets of sediment with a shovel to take home with us. We will then sieve all the sediment to differentiate the different sizes of the specimens. We will have several different sieve sizes from 5 mm all the way to 64 microns (very tiny material). We will clean everything so that we can sort through the different sizes to find what we are looking for – pieces of small blastoids!
The fossils are found in limestone beds (see by Maggie’s leg – there is a bench like extension from the rock) and in the shale layers (drab gray colored rock that makes up most of the bottom) that occur between the limestone beds. The big rock on top of them is sandstone and is part of an ancient river system.
I went into a cave last year and found what I am sure was a skull cap of some creature. It has the browl line for both eyes to include indentations for part of the eyeballs. It also had two small horns. One coming out on each side of the skull. It was either a fossil or the bone had been there so long that mineral had entirely encased it but I’m leaning more towards it being a fossil. Because of how heavy it was and the noise it made when I tapped it against another rock. It would have been a little bit smaller I’d say than a grown human head in size. I left it there and went on but later it donned on me that the brow line and eye sockets were placing the eyes on the front of the face. Doesn’t that mean it would have been a predator? A herbavor’s eye sockets would have been on the sides of the skull. What has me scratching my head is I didn’t think predators had horns. What do you think it could have been? If you have questions or have answers please contact me.
Hi Neil, Did you take a photo of this specimen you found? Please feel free to email an image to us and we will do our best to help you: timescavengers @ gmail.com.
I’m from western KY and the cave I found said fossil is local as well.