. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. 70 CAMBRIAN FAUNAS OF NORTH AMERICA. [ %. System into two divisions, Upper and Lower; the Lower to include all the original Taconic of the 1842 and 184G reports, with the exception of a portion of the Taconic Shite and the "Black Slate" of the 1847 report. § 162. The author describes the Upper Division of the Taconic rocks as consisting of beds of slate alternatin
. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. 70 CAMBRIAN FAUNAS OF NORTH AMERICA. [ %. System into two divisions, Upper and Lower; the Lower to include all the original Taconic of the 1842 and 184G reports, with the exception of a portion of the Taconic Shite and the "Black Slate" of the 1847 report. § 162. The author describes the Upper Division of the Taconic rocks as consisting of beds of slate alternating with shales, thin- bedded sandstones (some of which are coarse and brecciated), thin- bedded, bluish limestone more or less cherty and red, and brown and pnrple roofing slates. Sections are given that cross the Upper Taconic series at points from Highgate, in Northern Vermont, to Rensselaer County, New Yoru. Some of the sections have been studied since Dr. Emmons examined them, and the fact has been ascertained that he did not, in many instances, recognize the series of north and south faults that break the"continuity of the sections; but, after dedr 'ting all the errors, the Upper Taconic remains as a distinct formation uoneath tlio horizon of the Potsdam sandstone. § 103. In 1859 Dr. Emmons again reiterated his views of the Taconic, System in his little Manual of Geology, tender Taconic System (p. 8i) we read: This system desorves tho special attention of yeologists, for two reasons: 1st. It is probably the base of the sediments. M. It is also probable that it is the Palwozoic base, and, in both '•espects, it must be regard'"! as the oldest series of the sedimentary .class. This system is subdivided into Lower and Upper; the first consists of a conglomerate at the base, succeeded by silicious talcose beds of considerable thickness, in which there are frequently pebbles; next above are three thick beds of sandstone, separali'd by talcose slates; these are succ
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