Flock of fish in the stone prisoner: an unusual pattern of Eocene
Shale limestone slab preserved fossils, was in one of the Japanese museums.
30 may 2019 17:02
Biologist Nobuaki Mizumoto (Nobuaki Mizumoto) made the discovery by studying a fossilized plate from the collection of the dinosaur Museum in Fukui Prefecture (Fukui Prefectural Dinosaur Museum). She was found in the formation of the green river, located on the territory of modern States of Colorado, Wyoming and Utah. Here are preserved many specimens of the fauna of the Eocene period, when it formed the majority of mammalian orders.
In the plate size 570×375 mm 259 frozen fish of the family Percopsidae. In our days it is endemic to North America fish of two kinds and two kinds belong to the fossil. In itself it is studied well enough – in this case interesting was the situation in which the fish has been preserved to our days. They were killed in movement during the collapse of the shore or the dunes. They all sailed smoothly in one direction, and only a few strayed from the pack.
Scientists know a lot of fossils, where the fauna is killed at the same time, and it shows that many extinct species lived in groups. However, the evidence of the coordination of their actions exists that limits the understanding of evolutionary steps. Based on the analysis of a plate from a Japanese Museum biologists support the hypothesis that fish could interact with each other already 56-34 million years ago.
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