Abstract
ABSTRACT The Beck Spring Dolomite (upper Precambrian), Kingston Range, California, is divided into three informal members: lower laminated--150 to 200 m thick, composed of alternating laminae of pelletal and mosaic dolomite; middle oolitic--100 to 150 m thick, composed of mosaic dolomite with oolite, pisolite, and grapestone; and upper cherty--100 to 150 m thick, similar to the middle oolitic member except that it includes stromatolites and has been partially silicified and dedolomitized. Textural evidence suggests that the lower laminated member was deposited in a supratidal environment, and the middle and upper members in shallow, agitated waters of a subtidal environment. The characteristics of the Beck Spring Dolomite are similar to those of sediments now being deposited in parts of the Ba ama Banks.
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