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Fossilized shrimp burrow cross-section, Chaco Culture National Historical Park, New Mexico, USA.

Fossilized shrimp burrow cross-section, Chaco Culture National Historical Park, New Mexico, USA. During the Cretaceous period (60 to 80 million years ago), the Great Inland Sea covered this area. Crustaceans known as Callianasa major built tunnels under the sand, which filled with iron deposits after the sea receded, leaving casts of their burrows. Chaco is a UNESCO World Heritage Site.

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1403NM-0657_fossil-shrimp-burrow.jpg
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© Tom Dempsey / PhotoSeek.com
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2014 Mar 15-Apr 09: all: southwest (UT, NM, TX), OR, CA, New Mexico: Chaco Culture National Historic Park
Fossilized shrimp burrow cross-section, Chaco Culture National Historical Park, New Mexico, USA. During the Cretaceous period (60 to 80 million years ago), the Great Inland Sea covered this area. Crustaceans known as Callianasa major built tunnels under the sand, which filled with iron deposits after the sea receded, leaving casts of their burrows. Chaco is a UNESCO World Heritage Site.
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