Proceedings of Geological societies

1862 The Geologist  
Eoberts, Esq. The author described those zones of osseous and coprolitic matter which occur in parallel positions nearly throughout the range of sedimentary strata. Commencing with the most recently deposited bonebeds, he described in descending stratigraphical order those of the Eocene, Wealden, Oolitic, Liassic, Rhsotic, Carboniferous, and Silurian ages; pointing out the peculiarities in the position of each, and its range through the British area, and its relative correspondents in Europe
more » ... ndents in Europe and elsewhere. The author's conclusions were that these deposits presented the simple and normal life-forms of the period, unaugmented, as a rule, by any drift of dead fishes and Crustacea from other localities or by any cataclysmal change or local epidemic destroying life in the seas. Bone-beds he regarded as representing more nearly than other deposits the actual population of the areas in which they occur at that period of their past history, and he urged that special search should be made for life-relics in or near to such zones ; for a rock, he considered, was generally not only more fossiliferous and richer in the ordinary organisms of the period in the stratigraphical vicinity of a bone-bed, but also contained intermediate forms linking together past species with those which succeeded, a consequence of change in the water from salt to fresh, or vice versd, at the time of their deposition. The probability was that all bone-beds were deposited in shallow water, swept by light currents, under geographical conditions favouring the multiplication of fish and Crustacea in Archipelagic areas, which are ever seen to be crowded with marine life, and are the great feeding grounds of fishes. Of this we have a modern example on t h e cod-banks of Newfoundland. 2. " On a Superficial Deposit near the Blackfriarg E o a d . " By C. Evans, Esq. I n this deposit, some mammalian bones and land and freshwater shells of recent species have been found. The deposit consists of peat and woody clays, resting on a bed of gravel, and was exposed in the excavations for the Charing Cross Railway. MANCHESTEB FIELD-NATUBALISTS' S O C I E T Y . -W e have received the
doi:10.1017/s1359465600002963 fatcat:sj4x2dmgnvenpmmltw3mypvefm