Instruct: Classify the given review as either positive or negative.
Query: Obsolete!

I agree with Protero that this book is out-of-date. While I am not a paleontologist or even a biologist, I've noticed several glaring errors, such as the continued use of the phylogenetically incorrect term "mammal-like reptiles" for basal synapsids and therapsids and the inexplicable lumping together of Nimravidae and Felidae (the author speaks as if the nimravids and true saber-toothed cats such as Smilodon were the same lineage). The book seems to have a lot of good information, but I'm not sure what content I can trust. Perhaps it would be helpful in combination with a couple other solid vertebrate paleontology books for cross-reference, but I cannot recommend it alone.