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pearl-nautilus: “Sphenodiscus lenticularis, Fox Hills Formation, South Dakota Late Cretaceous (~ 70 mya) This specimen displays the extraordinarily intricate suture patterns that are characteristic of this species. Also evident is part of the...
Reblogged from: perks-of-being-chinese
01.10.14
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pearl-nautilus:

Sphenodiscus lenticularis, Fox Hills Formation, South Dakota
Late Cretaceous (~ 70 mya) 
This specimen displays the extraordinarily intricate suture patterns that are characteristic of this species. Also evident is part of the beautifully iridescent nacreous layer. A laterally flattened ammonite, this animal is thought to have been a relatively fast swimmer. 


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