150 



PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



[Jan. 8, 



formed coals, and not lignites, but they contain much pyrites. The 

 argillaceous strata I have never found sufficiently well exposed to 

 enable me to make an adequate examination of them. 



Lithology. 



Thickness. 



Fossils. 



{Clays of the Middle Lias.) 



(1.) Bed of coarse blue sand- 1 ft. 6 in 

 stone, in places highly micaceous, 

 with a few pebbles of quartz scat- 

 tered through it. The top of this 

 bed is highly pyritous ; and the 

 bottom passes into a grit. 



(2.) Beds of very sandy mica- 

 ceous blue clay, with a few irre 

 gular and inconstant bands of 

 sandstone. 



(3.) Alternations of very hard 

 laminated fine-grained micaceous 

 sandstone and shaly micaceous 

 sandy blue-clay. 



(4.) Thick mass of finely lami- 

 nated sandy and highly micaceous 

 blue-clay, the joints of which are 

 filled with sandstone. 



(5.) Soft, somewhat micaceous, 

 laminated sandstone of a greenish 

 colour (graduating downwards 

 into 6). 



(6.) Thick bed of blue mica- 

 ceous clay, with irregular bands 

 of sandstone. In its lower part 

 this bed becomes less sandy, and 

 contains some septaria. 



(7.) Alternations of clays and 

 limestones crowded with Oysters 

 and Cardinia, and other shells. 

 There are two principal beds of 

 limestone ; and these occasionally 

 contain quartz pebbles scattered 

 through them. 



(8.) Bed of greenish very mi- 

 caceous sandstone. 



(9.) Finely laminated, highly 

 micaceous, dark blue-clays. 



(10.) Soft greyish blue sand- 

 stone. 



(11.) Blue clay. 



3 ft. 



3 ft. 



8 ft. 



Fossils rare : — 



Belemnites acutus, Mill. 

 Pecten sublcevis, Phil. 

 Pecten liasinus, Nyst. 



Gryphma obliqua, Sow. (dwarfed 

 form), very abundant. Pleu- 

 romya, Pecten. Casts of other 

 bivalves. 



Few fossils. 



A few scattered Oysters. 

 Pleuromya unioides, Rom., sp. 

 Carbonaceous markings. 



3 ft. A few carbonaceous markings. 



About 15 ft. Carbonaceousmarkingsabundant. 

 A few fossils scattered through 

 it : — Bhynchonella variabilis, 

 Schloth.,var.;ima pectinoides, 

 [ Sow. ; Gryphoea obliqua, Sow. 

 (dwarfed form) ; Cardinia hy- 

 brida.rare; Pleuromya unioides. 

 Rom. ,sp., rare ; Belemnites acu- 

 i tus, Mill. ; crushed bivalves. 

 16 ft. Fossils very abundant : — Ammo- 

 nites and Belemnites; Gryphma 

 obliqua, Sow.; Cardiniahybrida, 

 Sow., sp. ; Lima pectinoides, 

 Sow., sp., &c. &c. (see list). 



{Estuarine sandstones, coals, ^-c.) 



2 ft. 



10 ft. 



9 in. 



Bottom not 

 seen, about 

 20 ft. 



Few fossils. Cast of Pecten. 



Full of Fucoid (?) markings. 



Crushed shells {Cardinia and 

 Pecten). Wood. 



Oysters and other shells (frag- 

 mentary). 



Cardinia hybrida, Sow., sp. 



Gryphma obliqua, Sow. (dwarfed 

 form). Crushed bivalves. 



At the top of this series of estuarine strata we find a formation, 

 consisting of alternations of blue micaceous clays and hard impure 



