1:34 



THE GEOLOGIST, 



Valoniemh, Cardinm Rhtjeticum, and Aviada contoHa are the chief niolluscan 

 fossils of this zone. 



The next group of strata are those with Ammonites Plamrbis and Am. John- 

 stoni. Some of the foregoing sections expose these beds, such as those at 

 Uphill and Wilmcote ; but they can be still better studied at Street in Somer- 

 setshire, where they have yielded so many fine Enab'osaurian fossils. These 

 beds are also well exposed at Brockeridge and Defford in the Vale of Glou- 

 cester, and at Binton in Warwickshire. 



Isastr(sa MurclmonfE occurs in this zone, and Ostrea Liassica is very charac- 

 teristic of some of its lower beds. Ichthyosauri and Plesiosauri of several 

 species are found in this series ; the latter chiefly in the lower part. Of the 

 two known specimens of the PL m,ef/acephalus, one was found in these beds near 

 Street, Somerset, and the other at Wilmcote, Warwickshire. 



The Ammmiites Bucklandi characterizes the next higher group of strata, 

 which are also known as the Lima-beds. These are well seen at Lyme Regis, 

 at the Church Cliff, and from the Broad Ledge to the shore, and yield several 

 species of Ichthyosaurus , also Am. Conybeari, A. rotiformis, A. angulatus, A. 

 Greenoughii, and A. tortilis. 



The Am. Tarneri beds are next, and can also be studied at Lyme Regis ; 

 they have yielded three species of Ichthyosaurus. Am. semicostatus and A, 

 BonnarcU belong to this zone. 



The Am,, obtusus beds succeed, between the Broad Ledge at Lyme and 

 Cornstone Ledge near Charraouth ; they apparently have no saurian fossils. 

 A. Brooki, A. stellaris, A. 'planicosta, and A. Dudressieri accompany A. obtusus. 



The next zone is that of the Am. oxynottis, with A. bifer and A. lacunatus. 

 The beds with Am. raricostatus comprise, in ascending order, the Ammonite- 

 bed, the Hippopodium-bed, the coral-band, and the Gryphsea-bed. This zone 

 is well seen near Cheltenham, at Lyme, and at Robin's Hood Bay in Yorkshire. 

 Am. armatus, A. nodulosus, and A. Guihalianus belong to the A. raricostus beds. 



Dr. Wright then pointed out that the Avicula contorta beds, like the Kossen 

 beds, contam a fauna special to themselves, and might as well be classed with 

 the Trias as with the Lias. They have a wide range in the South of England, 

 South Wales, the Midland Counties, and the North of Ireland. After some 

 remarks on the more important features of the several Ammonite-zones of the 

 Lower Lias, the author concluded by remarkmg that as Quenstedt and Oppel 

 had observed, the Middle Lias could be similarly subdivided by means of the 

 Ammonites peculiar to its several stages. 



LiVEEPOOL Geological SociExr, March 13, 1860. — Thomas XJrquhart, 

 Esq., in the Chair. 



The Secretary, G. H. Morton, Esq., F.G.S., exhibited a number of scratched 

 boulders, and shells of several species collected by him from the boulder-clay of 

 the district. He showed how the boulders were comiected with the grooved 

 and st riated surfaces of the sandstone in the neighbom-hood. 



Thomas 1. Moore, Esq., of the Derby Museum, exhibited Cetacean remains 

 from niorc recent h)cal deposits. 



Tlie llov. Henry H. Higgins brought forward his proposal for the arrange- 

 nuMit of the recenl and fossil species, m the new Liverpool museum, in natural 

 hislory scries, wiihout regard to stratigraphical formations. The Secretary, 

 Dr. Collingwood, and most of the members of the society, advised a geological 

 arrangement of the fossils. It was suggested that the ' Society should em-ich 

 11u> vahiable g(>ol()gical collection of the Royal Institution, which, with some 

 small atliiitions, woidd assume considerable importance. 



