Hey, it's my blog it can be any day I want. Seriously, I've got to start dong the Friday fossil on Friday. Problem is I'm not usually in my office on Friday. I could have the Monday fossil but that's not really the same is it. So without further ado:
The trilobite Olenellus, index fossil for the lower Cambrian. If you find one of these bad boys you know you're in the Lower Cambrian (about 550 million years ago)
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