. Maryland geological survey. e marked changes in the floras would seem to indicatethat this interval was a long one, during which the Arundel sediments,if originally continiious, were removed by erosion from large areas. The highly colored and variegated clays of the Patapsco formation,like the iron-bearing Arundel clays, evidently bear some relation to thegreat basic eruptive masses, plentifully iron-bearing, which lie to thenorth and west of them. This phase of the sedimentation is somewhatmore prominent in central Maryland, where the rocks of this characterare not only well developed, but
. Maryland geological survey. e marked changes in the floras would seem to indicatethat this interval was a long one, during which the Arundel sediments,if originally continiious, were removed by erosion from large areas. The highly colored and variegated clays of the Patapsco formation,like the iron-bearing Arundel clays, evidently bear some relation to thegreat basic eruptive masses, plentifully iron-bearing, which lie to thenorth and west of them. This phase of the sedimentation is somewhatmore prominent in central Maryland, where the rocks of this characterare not only well developed, but nearest the eastern margin of the Pied-mont belt. It is also probable that these ferruginous Patapsco clays werealso in part redeposited from the more richly iron-bearing clays of thesubjacent Arundel. The Patapsco sands were doubtless derived to aconsiderable extent from those of the Patuxent terrane. That the seaward tilting was not continuous or persistent in the same MARYLAND GEOLOGICAL SURVEY. LOWER CRETACEOUS, PLATE Fig. I.—VIEW .showing sands overlying arundel clays, cedar hill mine, TIMBERNECK, I MILE SOUTHWEST OF HANOVER.
Size: 1929px × 1295px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1901
