For #fossilfriday, my favorite crinoid, which is on a larger crinoid. The larger is about a cm across so the smaller is a few mm. From Mineral Wells Fossil Park in Texas, where one can collect fossils for non-commercial purposes for free.

Possibly a mollusc trail from 200 mya for fossil friday. Fell off the outcrop. #fossilfriday #ichnology

OK not sure if this was #TenMinMerlin or #mimicsgohard. Many of these I heard, including the chickadee, the titmouse, the sparrow and the grackle. I also heard the mockingbird and the wren. However, the killdeer was also the mockingbird. And the hawk was the blue jay. #merlinpwned

For #fossilfriday, I give you burrows preserved in sandstone from Springfield, Mass., that was used in a dam at the Whiting Reservoir in Holyoke. The dam's top layer has 100+ slabs, many of which have marks of Jurassic-Triassic ichnospecies (and a dino footprint). On purpose? Who knows? #ichnology

For #fossilfriday, I bring you mud swipes from the Jurassic-Triassic layer on a wafer of stone thinner than lavash bread, and about as brittle. Was it a biological cause? I can't say I am sure it was.

I believe these are burrows (about the size of a pencil) from the Jurassic-Triassic. They run horizontally in the stone; I find a lot that are compressed; this is the first slab I've found where the infill preserved the tube and then eroded out. #fossilfriday #ichnology

For #fossilfriday I bring you what may be a trackway from stone found in a pile downstream of the dam in Turner's Falls, Massachusetts. #ichnology #fossilid

Guessing on this #fossilfriday that this might be a segmented stem of a calamite. From Mount Tom in Hampden County, Massachusetts.