. The Quarterly journal of the Geological Society of London. ils are set forth in Table III (p. 274), withthe result that there are at least ]230 feet of blue shales andsandstones above the coal, and 1350 feet of brown and grey sand-stones (with occasional shales) below the coal, before any Nummuliticrocks appear. This section agrees very fairly with the upwardcontinuation of the section at Gorgona Dere and Sarkeui, distant25 miles south-east by east (see Table II, p. 273), where, for ahorizontal distance of 3600 feet to the southward of the highestNummulitic stratum yet recognized, there are
. The Quarterly journal of the Geological Society of London. ils are set forth in Table III (p. 274), withthe result that there are at least ]230 feet of blue shales andsandstones above the coal, and 1350 feet of brown and grey sand-stones (with occasional shales) below the coal, before any Nummuliticrocks appear. This section agrees very fairly with the upwardcontinuation of the section at Gorgona Dere and Sarkeui, distant25 miles south-east by east (see Table II, p. 273), where, for ahorizontal distance of 3600 feet to the southward of the highestNummulitic stratum yet recognized, there are vertical andsteeply-inclined brown sandstones and shales, overlain by greensandstones and clays, containing seams of lignite and leaf-impressions. On the northern shore of the Sea of Marmora, with possibleexceptions in small outcrops between Buyuk Tchekmedje and Silivri,these lacustrine sandstones and clays only reach the sea betweenGanos and Combos, where they form the high coast-cliffs of theTekfur Dagh, and have been cut off to the eastward bv the fault. Vol. 60.] EOCENE. ETC. SURROUNDING THE DARDANELLES. 249 bordering the falling-in of the Marmora sea-bed. The generalappearance of the strata is shown in fig. 1 (p. 248), reproducedfrom a photograph taken at a point near to which the soundingsshow an average gradient of 1 in 3 from the foot of the cliffsdown to a depth of 580 fathoms. On the south of the Sea of Marmora, coal-seams, clays, andshales interstratified with andesite, occur near Tchatal Tepe, south ofKamir. The principal seam consists of bright, bituminous coal,similar in quality to that found at Keshan. 18 inches thick, witha clay-floor and roof. Since writing my previous paper, I have had an opportunity oftracing these lacustrine deposits westward from the neighbourhoodof Examil, on the isthmus between the Gulf of Xeros and the Seaof Marmora, where they are overlain by Miocene strata. Theyappear again between Bulair aud Teni-keui, on the northern coastof the Gall
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
