grainstone

Grainstones are the main part of the section, among which the oolites, intraclast limestones and most bioclast limestones are cemented by sparry calcite.

颗粒灰岩在剖面中占绝大多数，其中，鲕粒灰岩、内碎屑灰岩和多数生物碎屑灰岩均为亮晶方解胶结。

The gamma ray value of reef bafflestone is higher than those of sparrenite and sparrudite , and lower than those of micritic limestone , wackstone , echinoderm grainstone and marlstone.

礁灰岩自然伽马值高于亮晶砂、砾屑灰岩，而低于泥晶灰岩、棘屑灰岩、泥晶生屑灰岩、泥灰岩性。