Jungle on a Seabed

Jungle on a Seabed (HM2CH)

Location: Wall, SD 57790 Pennington County
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Country: United States of America
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N 43° 50.606', W 102° 11.683'

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A jungle grew here. Before that, a shallow sea covered the land. Both are gone now, but both left evidence of their passing.

The sea's signature is ammonites, baculites, and clams, pearly fossils entombed in a fossil mud called the Pierre Shale. This shale is exposed in the gully below you.

A jungle sprang up after the sea drained away about 65 million years ago. For a long time tree roots broke up the shale, and chemicals from decaying plants produced a yellow soil. About 37 million years ago sediment from the west washed over the jungle.

The jungle rebounded, converting the new sediment into a red soil. Buried by later sediments, both yellow and red soils were fossilized. We call them the Yellow Mounds Paleosol and the Interior Paleosol.
HM NumberHM2CH
Marker ConditionNo reports yet
Date Added Thursday, October 2nd, 2014 at 5:03am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)13T E 725505 N 4858309
Decimal Degrees43.84343333, -102.19471667
Degrees and Decimal MinutesN 43° 50.606', W 102° 11.683'
Degrees, Minutes and Seconds43° 50' 36.36" N, 102° 11' 40.98" W
Driving DirectionsGoogle Maps
Area Code(s)605
Closest Postal AddressAt or near 15 SD-240, Wall SD 57790, US
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