183 



masses of madreporic Limestone, embedded in a fine-grained 

 cream-coloured mudstone. The corals are in a highly 

 crystalline state, and their specific forms are determined with 

 difficulty, unless the specimens have been long exposed to the 

 air. The following section exhibits the true relation of this 

 coral bed to the underlying and superincumbent strata. 



Section op Cobal Reefs in the Lower Division op the 

 Inperiok Oolite, near Brown's Hill, Gloucestershire. 



LiTHOLOGICAL CHARACTERS, "RvTm ORGANIC EeMAINS. 



and thickness. * Leading Fossils. 



Cream - coloured marl, 

 with inconstant layers 

 of mudstone, upper 

 part passing into a 

 loose friable freestone 

 20 feet thick. 



Fine grained, thick 

 bedded, oolitic Lime- 

 stone, very white and 

 emitting a metallic 

 ring when struck with 

 the hammer. 



Coarse brown ferrugi- 

 nous Oolite. 



Nodular masses of Coral- 

 line Limestone em- 

 bedded in a light- 

 coloured mudstone, 

 the corals highly crys- 

 talline. 



Brown ferruginous 

 Oolite, pisolitic, the 

 flattened concretions 

 not much exposed. 



Upper Freestones. 



Oolite Marl, 

 Middle Coral bed. 



bxjilding 

 Freestones. 



Lower Ragstones. 



Lower 

 Coral Reef. 



Pea-Grit. 



Thamnastrcea, Isasfrcea, 

 Axosniilia, Terebratula 

 fimbria, T. carinata, 

 T. maxillata, Rhyu- 

 chonella Lycetti, Lucina 

 Wrightii, Lima jaon- 

 tonis. 



Shelly fragments, inde- 

 terminable. 



Terebratula plicata. 



Latomeandra, Thamnas- 

 trcea, Isastrcea, Axos- 

 milia, Thecosmilia, 

 Peden Dewalquei, Tri- 

 chites, Lucina Wrightii, 

 Nerincea. 



Lima sulcata, Hinnitea 

 abjectus, Ceromya Bajo- 

 ciana, Avicula compli- 

 cata, Nerita costata, 

 TrocJiotoma carinata 

 Pygaster, Galeropygus, 

 Cidaris, Acrosalenia, & 

 Pseudodiadema. 



