In the Bahamas the post-Wisconsin rise in sea level flooded an irregular limestone surface which superimposed local increases and decreases in current velocity on the regional tidal regimen. The calcium carbonate supersaturated bank waters of the shoaler unsheltered rock areas were characterized by considerable current agitation and consequent oolite formation. The rate of oolite accumulation kept pace with or exceeded the rate of sea level rise, thereby resulting in the formation of extensive oolite shoals. The distribution of these shoals reflects the distribution of the limestone prominences which underlie them. The form variation exhibited by the shoals is apparently a product of the continuous or discontinuous nature of the underlying rock ridges.
Figures & Tables
Geometry of Sandstone Bodies
This volume contains the eight papers presented as a symposium of the Research Committee of The American Association of Petroleum Geologists at the 1960 annual meeting in Atlantic City, New Jersey. One paper presented in the General Session at that meeting, one reprinted paper, and three other solicited papers are also included.
The choice of “Geometry of Sandstone Bodies” as a timely and pertinent subject lor the 1960 symposium was made after an extensive canvass of Research Committee members and about fifty other geologists vitally interested in research in petroleum geology. From a group of about 15 proposed subjects, this one was selected as first choice by almost all those canvassed. Partly because of this high level of interest, the decision was made to attempt publication of the symposium as a special volume of The American Association of Petroleum Geologists. The word geometry in the title probably had several different meanings among the selectors, and for this reason an attempt was made to define the term adequately in order to establish uniformity of communication among symposium participants.
The dictionary definition of the word “geometry” is the science of magnitudes in space. In applying the term to the symposium theme, some modification and interpretation of its formal meaning were needed, and the following definition was therefore proposed for use in this volume—
Geometry of Sandstone Bodies—Spatial relationships of sandstone deposits within the sedimentary framework.
As used in this book, the subject is more than just a three-dimensional study in which thickness is added to areal distribution.