Fossil Shark Egg Case (Palaeoxyris prendeli) - Mazon Creek Labradorite ground water circulated silica along

ground water circulated silica along with the iron

and other shark egg cases were discovered roughly 175 years ago and because of their association with plants material in Mazon Creek concretions they were initially classified as plants

It is thought the warming of the last Ice Age combined with over hunting by humans were the main causes for Woolly Mammoth's extinction

The crystals are Pleochroism

Limited availablity of this quality

Fossil Shark Egg Case (Palaeoxyris prendeli) - Mazon Creek Labradorite ground water circulated silica alongPalaeoxyris sp. and other shark egg cases were discovered roughly 175 years ago and because of their association with plants material in Mazon Creek concretions they were initially classified as plants. Not all researchers agreed, and only years later was the relationship with modern forms of spiral shark egg capsules established. These long, narrow, spindle shaped fossils have surfaces marked by weak spiral lines in a helix. At least 9 species of