拍品 102
102
A RARE HORNED HETEROMORPH AMMONITE
A RARE HORNED HETEROMORPH AMMONITE
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A RARE HORNED HETEROMORPH AMMONITE

SOUTH DAKOT

细节
A RARE HORNED HETEROMORPH AMMONITE
SOUTH DAKOT
From the Upper Campanian, Cretaceous (circa 72 million years ago) the specimen of Didymoceras cheyennense on block of its original matrix supported with stand.
13 x 9 x 9in. (33 x 23 x 23cm.)
注意事项
These lots have been imported from outside the EU for sale using a Temporary Import regime. Import VAT is payable (at 5%) on the Hammer price. VAT is also payable (at 20%) on the buyer’s Premium on a VAT inclusive basis. When a buyer of such a lot has registered an EU address but wishes to export the lot or complete the import into another EU country, he must advise Christie's immediately after the auction.

荣誉呈献

James Hyslop
James Hyslop
+44 (0)20 7752 3205

拍品专文

This very rare and uncoiled ammonite is "among the most striking and remarkable natural objects known from the Cretaceous rocks of the U.S. Western Interior". The helical shape with looped tapering finial has provided much debate for palaeontologists as it would not have made an efficient swimmer, and the three different orientations of coiling would present different challenges to the mollusc living inside the shell as they changed the direction of growth.

更多来自 Science and Natural History

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