The Beck Spring dolomite is divided into three informal members: lower laminated--150-200 m of alternating laminae of pelletal and mosaic dolomite; middle oolitic--100-150 m of mosaic dolomite with oolite, pisolite, and grapestone; and upper cherty--100-150 m, similar to the oolitic except that it includes stromatolites and has been partially silicified and dolomitized. The lower laminated member was deposited in a supratidal environment, and the middle and upper members were deposited 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 Bahama Banks.

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