156 



This section was measured by Mr. Etheridge, and di-awn by 

 bim to illustrate an address read by our esteemed President, 

 Sir William Guise, Bart,, P.L.S., at the Annual Meeting of 

 the Club held at Elmore Court, 21st March, 1866. 



AusT Cliff. — If we proceed from Garden Cliff down the 

 Severn, the next section of the Avicula contorta beds is met 

 with at Aust Cliff, so long famous for its Bone-bed, and the 

 large number of Ceraiodus teeth which, from time to time, have 

 been collected therefrom. My friend William Sandeks, Esq., 

 E.E.S., of Bristol, many years ago carefully measured this 

 section, a matter of much difficulty from the mural character 

 of the escarpment, and the result of his labors were published 

 by Sir Henry De la Beche, in his valuable Memoir on the 

 Geology of the south-west of England. * Buckland and 

 CoNTBEARE having previously published a section of this cliff 

 in their Memoir on the south-western coal district of England.f 



In the upper part of the section are found about 3 feet 

 of grey argillaceous Lias Limestone, containing Ammonites 

 angulatus, Schloth., Lima gigantea, Sow., Lima antiquata, Sow., 

 and Modiola Hillana, Sow., representing the lower beds of the 

 Lima series. Below these are nine beds consisting of grey 

 marls and argillaceous Limestones, representing the zone of 

 Ammonites planorhis. The lowest Limestone bed of the series 

 contains scales of fishes, elytra of insects, with Modiola and 

 Terebratula ; this rests upon 8 feet of grey, light-colored marls, 

 with nodular Limestone, the equivalent of the white Lias series, 

 or the beds numbered from fourteen to nineteen, inclusive, in 

 the detailed section of Garden Cliff. The Cotham Marble caps 

 the marly beds; this well-known singular band forming the 

 base of the Ostrea series. The gap in the section is intended 

 to represent a space of 13 feet which could not be satisfactorily 

 examined. Below this space, 5 feet of thinly laminated black 

 shales are exposed; and beneath a fivciach band of hard 

 grey Limestone, containing scales of fish, Pecten Valoniensis, 

 Placunopsis alpina, Pleurophorus elongatus, representing the 



* Memoirs of the Geological Survey of Great Britain. Vol. i., p. 253 : 1846. 

 t Geological Transactions, 2nd Series. "Vol. i., p. 37. 



