The well preserved Erismatopterus levatus captured mid-swim. Implications of motion Shinya Miyata, Josai University. Instead they would have been flopping themselves about to try and remain in the dampest part of the puddle, and there would likely be signs of predation too. There’s no way that the fish would be facing the same direction in a tight oblong school formation (see the figure) if they were slowly asphyxiating in a pool. 3 Of course the problems with this suggestion are fairly clear from even a cursory view of the fossil slab. What wasn’t taken by predators was covered by layers of dirt and mud over the millenia and, thusly, this fossil”. Then, as the pool dried out, the fish all died. For example one commenter stated, “More than likely what happened is the fish got trapped in an isolated pool as the waters receded. Yet people who don’t want the uncomfortable implications of rapid processes entombing the fish have been forced to come up with similar non-sensical ideas. I can’t picture a three-dimensional school of fish sinking to the bottom and maintaining all their relative positions. Roy Plotnick, a paleontologist at the University of Illinois at Chicago said, “I’ve never seen this kind of preservation. 1 It is clear that they recognised that the fish school’s fossilisation absolutely required a rapid process. While the study did not conclusively give an answer as to how the fish were fossilized the authors suggested that a, “Rapid fixation of the fish shoal might be possible by sand dune collapse on shallow water, which can produce a bed in only seconds or minutes”. 2 The right circumstances? Swimming together in a school is a dynamic process and this slab amazingly preserves …this coordinated collective motion. Then, that rock has to survive intact long enough for a paleontologist to discover it and study it”. You need just the right circumstances to fossilize something like a school of fish in place within a rock. As pointed out in the New York Times, “It’s difficult, for instance, to find evidence of schooling fish in the fossil record. Swimming together in a school is a dynamic process and this slab amazingly preserves, in ‘freeze frame’ as it were, this coordinated collective motion. (From the perspective of created kinds, since other members of trout perch still exist, whether this species is ‘extinct’ is debatable.) Just before being fossilised they were swimming in the same direction. 1 The fish, each just under 1 in (2.5 cm) long, belong to Erismatopterus levatus, described as an extinct species. The oblong school of fish captured in the limestone slabĪ limestone shale slab from the Green River Formation, USA, has incredibly ‘captured’ a mass of 257 fish swimming together in a school. The official website does not provide any information about the changes in this version.A swimming school of fish fossilized in real timeīy Phil Robinson Shinya Miyata, Josai University.
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