Stratigraphic and Environmental Distribution of Gastropods in the Pincrest Sand (Pliocene) of Florida

佛罗里达州西南部的上新世“松树沙”可能是独一无二的，因为它含有丰富的软体动物化石，密度和多样性。今天，松树只在人工挖掘中暴露出来，而且这些挖掘往往非常短暂。两个坑复合体是个例外。APAC佛罗里达公司和Quality Aggregates，Inc.的矿坑是广泛的、长期的作业，为现场采样和检查化石地层提供了充足的机会。然而，APAC矿坑将于1991年初至年中关闭，重新填海为湖。虽然质量聚集操作将在这一日期之后继续，但个别坑目前正在被回收的过程中。在这些坑中暴露的松树沙中腹足类的分类和分布将进行广泛的采样和初步解释，然后才能进行填海，从而无法进行进一步的研究。

The Pliocene-aged "Pinecrest Sand" of southwestern Florida is possibly unique in the abundance density and diversity of fossil mollusks it contains. The Pinecrest is today exposed only in man-made excavations and these excavations are often very short- lived. Two pit complexes are exceptions. The pits of APAC Florida, Inc. and Quality Aggregates, Inc. are extensive, long- standing operations which give ample opportunity for sampling and examination of fossiliferous strata in situ. The APAC pit, however, is due to be closed and reclaimed as a lake by early to mid-1991. Although the Quality Aggregates operation will continue beyond this date, individual pits are in the process of being reclaimed right now. Extensive sampling and preliminary interpretation of the taxonomy and distribution of the gastropods in the Pinecrest sand exposed in these pits will be conducted before their reclamation makes further study impossible.