Thursday, October 31, 2013

There is a geology term

Ancient sea near Simferopol | Rest in Crimea
In one of the quarries near Simferopol after mining was exposed sea bottom Barremian age of 130-125 million years! On the exposed surface of yellowish limestone can see numerous fossilized remains of animals shellsea of the past. Here and spiral shells of ammonites and nautiloids, belemnites rostra (popularly known as "thunderbolt"), rounded shells shellsea of sea urchins and their needles, fragments of stems of sea lilies, sea stars, plates, brachiopods, sponges, solitary and colonial corals, ancient shark teeth , bivalves and gastropods.
If you watched the wonderful films BBC travel to the distant past of the Earth, then you can easily imagine how in the blue water column hang ammonites, belemnites flocks sweep the seabed in some places, nestled thickets of sea lilies, others shellsea - banks, oysters, scallops which were overgrown bryozoans and spiral houses serpulid annelid worms. In the mud swarming sea urchins on the rocks sheltered colonial corals, sea stars prowl along the bottom in search of something to eat. Schools of fish flit in the water to escape the serious and agile predators - fast dolphin-like ichthyosaurs, long-necked plesiosaurs, krokodilopodobnyh pliosaurs, sharks.
There is a geology term "hard bottom", or hard ground. Imagine the situation: on the sea floor sediments were deposited, which will eventually harden and become a sedimentary rock. Then, when the land went up, they were on the earth's surface, then they are partially or completely, as luck would be destroyed by erosion. Then, when the land sank, these sediments are covered shellsea by the sea again and begin to hide behind the younger shellsea sediments. shellsea If after a natural or man-made processes exposed surface sediments, and with fossil fauna, it turns a kind of "hard bottom" of the sea distant past of the Earth.
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