Jungle on a Seabed

Jungle on a Seabed (HM2CH)

Location: Wall, SD 57790 Pennington County
Country: United States of America

N 43° 50.606', W 102° 11.683'

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Inscription
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.
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Details
HM NumberHM2CH
Tags
Marker ConditionNo reports yet
Date Added Thursday, October 2nd, 2014 at 5:03am PDT -07:00
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
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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