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Aspiration
An extremely rare occurrence, occurred when a predatory fish ate prey that was too large and became lodged in its throat.
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Gar - Lepisosteus simplex
Like living gar species, fossil gars were fish eaters. One adult species was so large, that perhaps only alligators and crocodiles preyed on it. This is the largest fish of the Green River Formation. Length normally 24" to 30".
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Crossopholis magnicaudatus
A cartilaginous fish like sharks and rays, the fossils have no distinct backbone. Occasionally the rostrum (snout), skull, and fins ossified (turned bony) enough to be preserved. Length 20" to 30".
