The lower part of the New Market limestone (Lower Middle Ordovician) was studied in the Wilson Quarry east of Clear Spring, Maryland. It was subdivided according to bedding into six types: laminated dolomite, ribboned, lumpy, stromatolitic, intraclastic and bioclastic dolomitic limestones which are closely interbedded. Sediment filled and smaller spar filled mud cracks were found throughout the section, indicating that most of it accumulated above mean low water level. The six rock types are believed to represent sub-environments within the gross inter-supratidal environment: 1) marsh: lumpy limestones, 2) supratidal: laminated dolomite, 3) intertidal: ribboned and stromatolitic limestones.

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