68 



THE LIAS AMMONITES. 



Middle Lias. 



Alti- 



No. 



LiTHOLOGV. 



Thick- 



Organic Remains. 



tude. 







ness. 





n. 





Zone of Amaltheus spimatus. 



ft. 







4 



Dark-grey, sandy, micaceous marl 



18 



Amaltheus spinatus, Brug. Belemnites 

 breviformis, Ziet. 





5 



Indurated sand, forming large sand- 

 stone blocks 



8 







6 



Light-brown sands, mor6 or less indu- 





No fossils found to enable us to determine 







rated, and very micaceous 



56 



whether the bed belongs to this, or the 

 lower zone. 





200 



7 



Zone of Amaltheus margaritatus. 



Bluish marl, which forms a well- 

 defined band in the section 



6-8 







8 



Greyish, sandy, laminated marls, with 





Amaltheus margaritatus, Mont., Lytoceras 







irregular layers of nodules 



20 



fimhriatum, Sow., Belemnites elongatus, 

 Mill., Pleurotomaria similis, Sow., Cryp- 

 tcenia expansa. Sow., Pleuromya unioides, 

 Roem., Pecten cequivalvis, Sow., Limea 

 acuticosta, Miinst., Pinna Hartmanni, 

 Miinst., Rhynchonella acuta. Sow., R. 

 tetrahedra. Sow., R. calcicosta, Quenst., 

 Gryjihcea gigantea. Sow. 





9 



Foxy coloured sandstone, with from 

 12 — IG irregular bands of stone 

 forming the " rough bed " of the 

 workmen 



40 







10 

 11 



Band of Crinoidal limestone 



20 



Pentacrinus suhangularis, Mill. 



Grey sandy clay, in parts micaceous ... 



100 





Band of ferruginous septaria. 









12 



Grey laminated sandy clay 



17 







13 



The " Starfish Bed," hard, grey, mica- 

 ceous sandstone : large blocks from 





Ophioderma Egertoni, Brod., Lytoceras fim- 

 hriatum. Sow., Amaltheus margaritatus, 







this bed lie on the shore 



6 



Mont., Belemnites elongatus, Mill. 







Zone of Aegoceras Henleyi. 









14 



Grey marls, breaking up into cuboidal 

 masses ; in the upper part are several 

 rows of small, fossiliferous nodules ; 

 this bed is much thicker, and better 

 seen at Golden Cap 



76 



Aegoceras Henleyi, Sow., Aeg. Bechei, Sow., 

 Aeg. striatum. Rein., Aeg. j)lanicosta, 

 Sow., Aeg. Davosi, Sow. 







Base of Down Cliffs 



;eras J 



AMESONI. 



Zone of Aegoc 



The grey or micaceous marls attain a great thickness at Golden Cap, where they rest 

 on the Belemnite-bed. These marls contain several stages of life, which have not been 

 worked out with sufficient accuracy to enable me to define the limits of the different 

 zones. Fragments of Aegoceras Jamesoni and Aeg. mhmuticum have been collected in the 

 lower part of this deposit, and Aegoceras Davoei, Henleyi, and Bechei, in the upper. 



In Gloucestershire, beneath the zone of Aegoceras Henleyi, two other zones are 

 characterised by Amaltheus Ibex and Aegoceras Jamesoni, and these are probably com- 

 prised in the grey, micaceous marls at Golden Cap, which here attain so great a thickness. 



