介壳灰岩（Bioclastic limestone）
产地：山东省新泰市
特征：
生物碎屑灰岩的一种，是以生物碎屑被碳酸钙胶结而成的灰岩。生物碎屑含量变化于40%～90%，种类繁多，生物碎屑主要为庄氏虫的头甲和尾甲，呈完整形体或碎片，由破碎的生物贝壳被碳酸钙胶结而成。胶结物主要为泥晶或亮晶的方解石，偶含石英与黏土矿物。由于生物碎屑含量与胶结程度不同，使其物理性质变化较大。通常坚韧度比较小、抗压强度较低、小于100MPa，密度2.3g/cm3，孔隙率大、质地比较松。呈生物碎屑结构，块状构造。结晶介壳灰岩往往发育在高能介壳滩中，压实、胶结、交代等成岩作用强烈，介壳的原始成分及结构都已发生明显变化，以方解石质的壳体为特征，介壳间往往为镶嵌状、连晶状含铁方解石胶结。
浅湖—半深湖较低能滩相中含有机质泥质介壳灰岩是主要的储集层和产层，单层厚度薄，但累积厚度较大，分布面积广，常夹于暗色泥页岩中，源储一体，更有利于成藏。这类泥质介壳灰岩的壳间孔构成了主要的储集空间，壳间孔平行于壳体的长轴方向排列，并常见黑色有机质充填。
采集人：陈勇、颜世永、裴仰文、王健、段忠丰
Bioclastic limestone
Provenance: Xintai, Shandong, China
Characteristics:
In limestone rocks there are different types of possible bioclasts, depending on the region, time and the climate during the formation stage. Skeletal fragments: this type of limestone texture can be found as whole micro-fossils, whole large fossils or broken up fragments of larger fossils. This is the most common texture. The kinds of skeletal particles present depend upon the age of the rock and the paleo-environmental conditions from the time they were deposited. With these different types of fossils, certain ones will be more dominant in a certain rock compared to others. Trilobite skeletal fragments.
The climates and wave conditions play a role on the formation of skeletal fragments by that organisms like branching forms of bryozoan are fragile and are not found in high wave energy environments. Found in limestone units that have been deposited under quite less active water conditions.
Gatherers: Chen Yong, Yan Shiyong, Pei Yangwen, Wang Jian, Duan Zhongfeng