. Geology and underground water resources of northern Louisiana . (D) EARLY OLIGOCENE TERTIARY iring the Cretaceous Tertiary epochs. Water: Present Guli of Mexico ^ La. Geoi,. Surv. Report of 1905, Buti,. 4, Pi,. XXVII. LEGEND. ED if t UHsjnidnl lm-*> 1 >* 1 t(l 1 ^ 1 ,.,„ rroasi plants 1 / t ^wna^Bltum 1 n ii ill> forbnck K. Uird uibaUasLud From V. S. AK ^f^^™*^^ GKotoGrCAi. Map ok Northrrn LopishnaADndged from Veatchs map. PI. III., professional paper No. 46. vhatch] Underground Water of Northern La. 19 oue point from below, just as a sharp-pointed little dome mightbe form
. Geology and underground water resources of northern Louisiana . (D) EARLY OLIGOCENE TERTIARY iring the Cretaceous Tertiary epochs. Water: Present Guli of Mexico ^ La. Geoi,. Surv. Report of 1905, Buti,. 4, Pi,. XXVII. LEGEND. ED if t UHsjnidnl lm-*> 1 >* 1 t(l 1 ^ 1 ,.,„ rroasi plants 1 / t ^wna^Bltum 1 n ii ill> forbnck K. Uird uibaUasLud From V. S. AK ^f^^™*^^ GKotoGrCAi. Map ok Northrrn LopishnaADndged from Veatchs map. PI. III., professional paper No. 46. vhatch] Underground Water of Northern La. 19 oue point from below, just as a sharp-pointed little dome mightbe formed in a sheet of dough by pushing upward with a bluntpencil, indicate similar igneous intrusions beneath these greatthicknesses of relatively plastic, recently deposited Cretaceoussediments as the cause of these domes/ Whatever their true origin, the sea floor showed, near theclose of the Cretaceous, or in the early Tertiary, a series of steep-sided, more or less circular elevations. These elevations wouldnaturally modify the conditions existing in the portions of thesea where they were sufficiently contiguous to materially interruptthe oceanic circulation, and it is perhaps to such an interruptionby the Texas group
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