| They are mainly bioclastic limestones, containing abundant fossils and fossil fragments. |
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| The host lithology consists of bioclastic silt and siliciclastic sand, characteristic of deposition in a biostrome flank setting. |
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| The facies consists mainly of brownish grey laminated bioclastic packstone and thinly bedded cherts. |
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| On the margin of the channelled scour, the fill deposits pinch out leaving only a bioclastic lag of oysters and pectinids. |
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| The middle member is dominated by gray silty shale grading upwards to bioclastic siltstone interbedded with bioclastic limestone. |
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| The bioclastic facies of the Upper Domerian and Upper Toarcian Limestone Mbrs suggest periods of shallower sedimentation above storm wave base. |
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| Slope sediments consist of a medium-grained, bioclastic floatstone to rudstone with abundant bryozoans, bivalves and branching coralline algae. |
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| Merriam also noted that bioclastic beds occurred in the Susan Duster Limestone Member, and that the shell fragments were so numerous as to constitute a coquina. |
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| Well-rounded clasts include lava, volcaniclastic sandstones and bioclastic limestones with nummulites, bryozoa, microbial carbonate and bivalve material. |
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| The Middle Member is 57.3 m thick and is mainly composed of gravel-bearing calcarenite, bioclastic limestone, bioclastic micrite, and reef limestone. |
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| The Zhaohuajing Formation is composed of dark gray to black, argillaceous, nodular, bioclastic limestone with calcareous sandstone and siltstone in the basal part. |
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| The boundaries are sharp and erosive, removing most of the foreshore deposits of the underlying shoreface units, and are paved by a lag of bioclastic debris. |
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