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Shales: formed from silt and clay that have hardened

to form rock.

Arenaceous: shale with large amounts of sand

argillaceous: shale with large amounts of clay

carbonaceous: shale with large amounts of coal

calcareous: shale with large amounts of limeand

calcium from shell life forms

sandstone: composed essentially of pressure-

cemented grains of sand (quartz)

conglomerate: composed of cemented pebbles intermixed

with sand

- if the grains are angular, the rock is

termed breccia.

- if the rock is a glacial deposit, it is called tillite.

Limestone: chemical sediment consisting primarily of

calcite (calcium carbonate)

dolomite: limestone in which some calcite has been

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12y ago

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