Saturday, January 24, 2015

Ordovician by Chloe, Kristin, and Dani

Ordovician Period (488-443 mya)
By: Chloe Roth, Kristin Haug, Dani Lacy

The Ordovician period (488-443 mya) covered Ohio in a warm, shallow, sea. The sea was deepest over eastern Ohio and oftentimes subsided enough to turn the western part of the state into low, muddy, islands. During this period, Ohio lay 20 degrees south of the equator.  Rock, especially limestone and shale, was created during the Ordovician period. Limy sediments and volcanic activity contributed to the creation by providing materials from which rock is born. 

                During the Ordovician period Ohio was 20 degrees south of the equator and mostly covered by a warm, shallow sea. 

                                                   The western part of Ohio emerged from the sea as low, muddy islands. 
Limestone has two aspects that fit into its criteria; it is composed of Calcium Carbonate, and is a sedimentary rock. Calcium Carbonate commonly found in sedimentary rock like Limestone was most prevalent during the Ordovician area. Limestone is the most popular a non-siliciclastic rock. 
Formations of Limestone are primarily found in layers. Limestone is often a lighter-toned sedimentary rock, for example could be a soft grey color.

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