Page 200 - Carbonate Facies in Geologic History
P. 200
Platy Algal Mounds in Basins and on Shelves 187
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noted through the barrier rim. These biostromal detrital buildups contain as
many as 20 levels of porosity separated by shales. Presumably the levels represent
former water tables and the porosity results from leaching and solution. This
giant complex of mUltiple reservoirs had reserves of 21/2 billion barrels of oil,
90% of it in reefy buildups!
More common is the formation of platy-algal mud mounds across the shallow
shelves. These have been extensively studied both in Kansas and in north central
Texas where they are especially well developed in Missourian strata which repre-
