这是二迭纪早期的一个小小的湖泊，这里的土地在干旱转和湿润之间轮流转换。干旱到来了，小湖和远方的河流失去了联系，大片的苏铁和蕨类植物正被松树和其它裸子植物所取代。在横倒的树下，一条远古鲨鱼正在逼近一只潜伏在阴影里等待猎物的两栖动物，现在，这只捕食者将面临被捕食的危险。在右边的枯木上，一只小小的爬虫目睹了这一切，在它的下面，几只飞镖样脑袋的家伙若无其事地游过。 In a small ox-bow lake the large shark Orthacanthus attacks the tetrapod Eryops. Eryops, which is related to frogs and salamanders, was also a common predator, lurking in shallow water for prey. On the right are the enigmatic lepospondyls, consisting of the terrestrial microsaur Pantylus crawling on a log and the boomerang-skulled Diplocaulus swimming below. In the right background is the aquatic anthracosaur Cricotus, a large, crocodile-like predator related to the more terrestrial Diadectes, seen in the far left background.(words from amnh.org)