grainstone

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

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

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.

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