Bulletin of the Geological Society of America . Figure 10.—Closely folded and fluted gray and white handed micaceous Marhle of theConestoga Limestone in a small overturned Syncline Face of quarry a half mile northwest of Figure 11.—Fossiliferous Beds in the Conestoga Limestone Massive beds of dolomite and limestone conglomerate are overlain at left by darkargillaceous ribbed fossiliferous limestone. View taken at York Lime & Stone , 6 miles east of York. DETAILS OF THE CONESTOGA OVERLAP 517 the base of the formation in the vicinity of Columbia increase in thick-ness wes
Bulletin of the Geological Society of America . Figure 10.—Closely folded and fluted gray and white handed micaceous Marhle of theConestoga Limestone in a small overturned Syncline Face of quarry a half mile northwest of Figure 11.—Fossiliferous Beds in the Conestoga Limestone Massive beds of dolomite and limestone conglomerate are overlain at left by darkargillaceous ribbed fossiliferous limestone. View taken at York Lime & Stone , 6 miles east of York. DETAILS OF THE CONESTOGA OVERLAP 517 the base of the formation in the vicinity of Columbia increase in thick-ness westward and in the vicinity of York give rise to prominent lowridges and hills capped by sandstone. Southwest of York the overlap relation, which in itself is complicated,is further confused by thrust-faulting. The Conestoga limestone islargely restricted to the southeast side of the valley, but some outliersof the basal sandstones and conglomerates of the formation cap hillsnear the north border of the valley. Several excellent exposures of thecontact of the basal beds of the Conestoga on the Ledger dolomite wereseen in the Pennsylvania Eailroad cuts northeast of Spring Grove, wherefolding has brought the underlying dolom
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
