I860.] 



weight lias and b0ne-beb. 



Table showing the Zones of the Lower Lias. 



411 



Counties j 



Gloucester. 

 1 Warwick. 

 Somerset. 



o 



a 



~. 



u 

 o 



i 



Clay -with. Ammonites Jamcsoni, Sow. 















, a. Dark clays and shales, often ferruginous, 

 ' Zone of containing Hippopodia.m ponderosum, 

 Ammonites \ Gryphaea obliuua, Cardinia Lister/, The- 

 raricostatus. coct/athus ruqosus, Am. raricostatus. Am. 





















































armatus, and Am. densiaodus 



* 



* 





* 





- b. Dark clays and shales, much impregnated 





Zone of with iron, containing Ammonites oxy no- 















Am. oxL'iiotus. 1 tits, Am. bifer, Am. lacunatus, and Acro- 



















tt 



* 





* 





■ c. Greyish argillaceous limestone, in tliin 



p 



o 



Zone of beds alternating with beds of clay and 













Am.obtusus. 1 marl, and containing Ammonites obtusus, 













\ 



Am. LircJ/ii, and Am. Dudressieri 



# 



* 





-;:- 





d. Hard, dark, slaty clays, or light-coloured 



« 



Zone of shelly limestone, with Cardinia ovalis, 















Am. Turneri. | Peru tacrinus tuber •culatus, AmmonitesTur- 













'3 



*- ncri, Am. semicostatus, and Saurians 



-:.- 



* 





* 



* 



1 



, e. Bluish-grey limestones, with beds of clay, 













J 



Zone of containing Lima antique/, L. gigantea, 













-< 



Am.BucklandiA Ammonites angulatus, Am. Bucklandi, 















*■ Am. Conybeari, and Am. rofiformis 



* 



K 



* 



• 



• 





//. Greyish or light-coloured limestones, in 

















iln'n beds, intcrstraiifled with finely lami- 

















nated .-hales; the limestones forming the 

















J'aving-beds of Warwickshire and the 

















White Lias of Dorsetshire; and contain- 

















ing Ammonites planorbis, Am. Jbhnstoni, 















Zone of 



Limn punctata, L. gigantea, L. pecti- 















Am. planorbis. 



noides, Hemipcdina Tomesii, and spines 



















* 



* 



X 



* 



* 



o 



" r 



g. Hard dark-grey limestone, containing 













pq 



Ostrca J 

 Beds, i 



Ostren Hassica in great abundance, with 













3 



skeletons of P trtts megacephahu, 













o 



E 



J'. HawkmsH, Ichthyosaurus inter 













43 





* 



* 



* 



* 



• 



'3 



,h. Dark shales, with Hun bands of lime- 

 „ . often pyritio, and thin Ixxls of 



'"'"' ° J Light-coloured mica ins sandstone, with 



'/ '""" 1 a thin band of bone-breoms near the base, 

 contain .1 ■ la oottt i . R 













O .' 



S 























<: 













c 













o 



^ V , and Pullastra arenicola 



•,l Marls of the Keeper. 



* 



* 



* 



* 



• 



In oonclading these observations' on the different zones of the 

 Lower Lias, 1 would remark that nearly all the species contained in 

 these beds differ from 1 1 » « • species of 1 1 1 « - Middle l-ia-, which, in like 

 manner, can be divided into Beveral distinct eones by the AmmonUet 

 contained in them. I must reserve my observations on this subject 

 to a future communication, in which I propose giving a table show- 

 •ng the Btratigraphioal distribution of all the Tim rUibrata of the Lia-. 



