The Inquisitive Biologist has an interesting (and complete!) book review of "Carboniferous Giants and Mass Extinction: The Late Paleozoic Ice Age World" by George R McGhee, Jr. It caused me to run out (ok, click) and buy the ebook. So far, it's very good. The ebook is available at all the usual book sites, Amazon, Barnes and Noble, and Kobo. If you aren't locked into the Amazon world, Barnes and Noble has the best price.
Not so long ago, the idea that giant reptiles once roamed the earth was novel, unbelievable to some, but their reign represents only one part of deep time. Go back further in time, to the Carboniferous (358.9 to 298.9 million years ago), and you will find a world of giants as bizarre and otherworldly as the dinosaurs must have once seemed to us. A world where clubmoss trees grew up to 50 metres tall, with scorpions as large as dogs and flying insects the size of seagulls. With Carboniferous Giants and Mass Extinction, palaeobiologist George McGhee, Jr. presents a scholarly but fascinating overview of the rise and fall of this lost world, and why it still matters to us.