This Earth Cache is designed to show you an interesting spot in Jefferson City relating to the erosion of a Dolostone rock bluff. The posted coordinates will lead you to a bluff of Limestone, Chert, and Dolomite, or as it is often referred, Dolostone. Dolostone, or Dolomite rock, is a sedimentary rock that contains a high percentage of of the mineral Dolomite. In the past it was commonly called Magnesium Limestone as there is a slight resemblance of Limestone rock. This bluff was laid down in the Ordovician Period as part of the Jefferson City Formation. The way the Dolostone wall became visible was via erosion from the nearby creeks and streams. After water seeps into these crevices the process of frost wedging takes over. The Dolostone wall has also eroded due to the various fault cracks near it's base. Sources, A.Winslow Missouri Geological Survey #6 1894- 1895 and NGS Survey of Jefferson City Missouri 1988 -1989
Requirements to claim this find. 1, In what period was the Jefferson City Formation laid down? 2, How many fossils can you see in the Dolostone wall? A.Many, B.Few, C.None? 3, About how wide is the exposed Dolostone? 4, About how tall is the Dolostone wall? 5,Where is the water eroding the rock? Top, Bottom, or Middle? 6, Although not required it would be nice if you would post a picture of the Dolostone wall.