carbonate shelf造句

• Its facies are indicative of a mixed siliclastic  carbonate shelf environment that is shallowing through time.
• With progressive subsidence of the basin during the Pennsylvanian, the western basin hinge line and carbonate shelf, continued migrating west.
• These have been interpreted almost universally as exposures of the carbonate shelf facies in windows of the Roberts Mountains thrust sheet, and to prove the existence of that thrust sheet.
• The Traverse Group formed as a shallow carbonate shelf during the Devonian period ( ~ 419 to 359 Ma ), when the most recent supercontinent, Pangea, was just beginning to take shape.
• In the eastern part of the state, a north-trending fossil-rich carbonate shelf of Ordovician to Devonian age, termed the carbonate or eastern assemblage, gives way westward to a contemporaneous expanse of siliceous sedimentary deposits and minor mafic volcanic rocks termed the siliceous or western assemblage.