Under the Sea

Under the Sea (HM24UD)

Location: Wall, SD 57790 Jackson County
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Country: United States of America
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N 43° 46.325', W 102° 0.212'

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Inscription
Ammonite fossils found in the park are evidence that this area was under water 75 million years ago. Some ammonites could grow to more that three feet across and served as a food source for giant mosasaurs and other predators.

The Western Interior Seaway once split North America in half. In some places, this vast inland sea was 2,500 feet deep and 600 miles wide.

Ammonite
Placenticeras

As the sea receded, ammonites could no longer survive in this area. Ammonites are relatives of octopuses and squid but with coiled shell over their bodies. All ammonites went extinct 65.5 million years ago.
Details
HM NumberHM24UD
Tags
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Placed ByBadlands National Park, National Park Service, U.S. Department of the Interior
Marker ConditionNo reports yet
Date Added Monday, January 22nd, 2018 at 1:02am PST -08:00
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Locationbig map
UTM (WGS84 Datum)13T E 741161 N 4850923
Decimal Degrees43.77208333, -102.00353333
Degrees and Decimal MinutesN 43° 46.325', W 102° 0.212'
Degrees, Minutes and Seconds43° 46' 19.5" N, 102° 0' 12.72" W
Driving DirectionsGoogle Maps
Area Code(s)605
Closest Postal AddressAt or near SD-240, Wall SD 57790, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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