In contrast, trilobite size was strikingly correlated with fluctuations in marine redox (i.e., marine oxygen levels), especially during the well-known anoxic events of this interval.

Get Instant Summarized Text (Gist) Fossil analysis from Alaska's Prince Creek Formation reveals the oldest known relatives of salmon, carp, and pike, dating to about 73 million years ago. Advanced ...

At first, it was speculated it preyed on hard-shelled creatures like trilobites, but recent studies suggest it likely hunted faster, soft-bodied animals instead. What’s interesting is that even ...

A recent study shows that marine oxygen levels were crucial to the evolution of Early Paleozoic trilobite body size, suggesting that oxygen may have influenced the evolution of other animals' body ...