Science-gossip . Jeffreys and by Mr. S. V. Wood, and its contentswere afterwards worked out by Messrs. Kendalland Bell. About a hundred species have beenobtained thence, mostly mollusca. The depositstands about 100 feet above ordnance datum, anddips about 50 to north-north-west. In one sectionit shows yellow sand and clay, blue clay, and finequartzose sand, of which, however, the blueclay alone is fossiliferous. The evidence of themolluscs seems to show the deposit to be of Middleor Lower Red Crag age. Among characteristicmollusca which occur are Littovina subaperta, Cono-vuhis pyraviidatis, N
Science-gossip . Jeffreys and by Mr. S. V. Wood, and its contentswere afterwards worked out by Messrs. Kendalland Bell. About a hundred species have beenobtained thence, mostly mollusca. The depositstands about 100 feet above ordnance datum, anddips about 50 to north-north-west. In one sectionit shows yellow sand and clay, blue clay, and finequartzose sand, of which, however, the blueclay alone is fossiliferous. The evidence of themolluscs seems to show the deposit to be of Middleor Lower Red Crag age. Among characteristicmollusca which occur are Littovina subaperta, Cono-vuhis pyraviidatis, Nassa granulata, Cohimbella sulcata,Nassa reticosa and Turritella incrassata, togetherwith others of a southern character, such as Fususcorneus, Nassa mutabilis, Cardium papillosum andCardita aculeata. Four species of polyzoans weremet with, common to the Coralline Crag and theItalian Pliocenes, fragments of Balanus, andseveral swimming crabs, detached plates andspines of Echini, three or four species of annelids,. View of Coal-Pit at Brora, Caithness.(From CadelVs Geology and Scenery of Sutherland.) dolomitization of the Carboniferous Limestoneis remarkable, and almost peculiar to that aroundLlandudno, though it also occurs at Penmon inAnglesey. The Lower Brown Limestone hasbeen almost entirely converted into dolomite andportions of the overlying sub-divisions. The fillingof the faults has often been changed into dolomite,and the alteration of the limestone is generally ina very capricious manner. In the discussion whichfollowed, Professor Sorby made some interestingremarks on attempts which he had made toartificially produce dolomitization of carbonate oflime. He had, however, only been able to producepseudomorphs in carbonate of magnesia, but notthe two combined as dolomite. Pliocene Deposit in Cornwall.—At St. Erth,in Cornwall, is a very interesting deposit, ofPliocene age, in the shape of certain sands andclays which have been exposed on the glebe-landbelonging to the vic
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