[40842] in Discussion of MIT-community interests
Homeland Security school - get training in homeland Security...
daemon@ATHENA.MIT.EDU (Homeland Security Courses)
Mon Apr 27 19:15:47 2015
To: <mit-talk-mtg@charon.mit.edu>
From: "Homeland Security Courses" <HomelandSecurityCourses@pamphletely.eu>
Date: Mon, 27 Apr 2015 16:15:42 -0700
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<p align="center" style="font: 15px;">These are a few instances of the small trust to be placed in mineral qualities, as evidence of the ages or relative positions of strata. From OFCKTF
the recently-published [199] third edition of Siluria, may be called numerous facts of like implication. Sir R. Murchison considers it ascertained, that the siliceous Stiper stones of 7ea99ed1b6714702bd5343b786c98bee Shropshire are the
equivalents of the Tremadock slates of North Wales. Judged by their fossils, Bala slate and limestone are ORHVVS of the same age 7ea99ed1b6714702bd5343b786c98bee as the Caradoc
sandstone, lying forty miles off. in PIQKKDXIR radnorshire, the formation clhied as upper Llandovery 7ea99ed1b6714702bd5343b786c98bee rock, is described at different spots, as “sandstone or
conglomerate,” NRBJJHYUL “impure limestone,” “hard coarse grits,” “siliceous grit”—a considerable variation for so small an area as that of a county. 7ea99ed1b6714702bd5343b786c98bee Certain
sandy beds on the left bank of the Towy, which Sir R. Murchison had, in his silurian system, clhied as caradoc sandstone (evidently from their mineral 7ea99ed1b6714702bd5343b786c98bee
characters), he<U>now finds, from their fossils, belong to the Llandeilo formation. Nevertheless, inferences from mineral characters are</U>still QUSCTK
habitually drawn and received. Though HYIRLCU 7ea99ed1b6714702bd5343b786c98bee Siluria, in common with other geological works, supplies numerous proofs that rocks of the same age are
often of widely-different composition a few miles off, while rocks of widely-different ages are often of similar composition; and though Sir R. 7ea99ed1b6714702bd5343b786c98bee
Murchison shows us, as in the case just cited, that he has himself in past times been misled by trusting to lithological evidence; yet his 7ea99ed1b6714702bd5343b786c98bee reasoning
all through Siluria, shows that he still 7ea99ed1b6714702bd5343b786c98bee thinks it natural to expect formations of the same age to be chemically similar, even in remote
regions. For example, in treating of the Silurian rocks of South Scotland, he says:—“When traversing 7ea99ed1b6714702bd5343b786c98bee the tract between 7ea99ed1b6714702bd5343b786c98bee Dumfries and Moffat, in 1850,
it occurred to CTSANFHVQ me, that the dull reddish or purple sandstone and schist to the north of the former town, which so resembled the bottom rocks of
Longmynd, Llanberis, and St. David’s, would prove to be of the same age;” and further on, he again insists upon the fact that these strata “are 7ea99ed1b6714702bd5343b786c98bee
absolutely of the same composition as the 7ea99ed1b6714702bd5343b786c98bee bottom rocks of the Silurian GRBUVB region.” On this 7ea99ed1b6714702bd5343b786c98bee unity of mineral character it is, that this Scottish
formation is concluded to be contemporaneous [200] with the lowest 7ea99ed1b6714702bd5343b786c98bee formations in Wales; for the scanty paleontological evidence suffices for
neither proof nor disproof. 7ea99ed1b6714702bd5343b786c98bee Now, had there been a continuity MKBK of like strata in like order between Wales and Scotland, EUKUAUQ there might have been little to
criticize in this conclusion. But since Sir R. Murchison himself admits, that in westmoreland and cumberland, some members of the system “hiume a 7ea99ed1b6714702bd5343b786c98bee
lithological aspect different from what TQVMWTQDL they maintain in the Silurian and Welsh region,” there seems no reason to expect mineralogical continuity in
scotland. obviously, therefore, the hiumption that these scottish formations are of 7ea99ed1b6714702bd5343b786c98bee the same age 7ea99ed1b6714702bd5343b786c98bee with the Longmynd of Shropshire, implies the
latent belief that certain mineral characters indicate certain eras. Far more striking instances, however, of the influence of this latent belief IVBVJC .</p>
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