Bulletin of the United States Geological SurveyThe Survey., 1905 |
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abundant Ambocœlia gregaria appears Atrypa Atrypa reticularis Aviculopecten barren Bigstone Gap black shale Brook section 1455 Bullitt County Camarotœchia Canoe Camp Catawissa section 1453 Catskill Chemung Chonetes common correlation Covington crassimarginatus Creek Cyrtina hamiltonensis Delthyris mesicostalis Devonian Douvillina E. M. KINDLE Edmondia fauna Faunule of section Faunule of zone feet following faunule following species formation fossils Franklindale Genesee Gulf Brook section H. S. WILLIAMS Hamilton Hicksville Hollowing Run section horizon Ithaca Ithaca fauna Kentucky Knobstone lachrymosa lævis last zone Leptodesma sp limestone Louisville Mansfield section 1459 Meristella Modiomorpha mucro Nunda Ohio Oriskany outcrops Palæoneilo paleontology Parksville perplana plate showing Platyceras posterus Productella Proetus quarry rare red beds Rept Riley station River Romney shale Run section 1454 sandstone sandy beds sandy shale Schizophoria shaly sandstone Sphenotus Spirifer disjunctus stone striatula Stropheodonta Survey Tentaculites thickness thin-bedded sandstone Tioga section 1460 ule of zone unconformity West Virginia White Sulphur Springs York
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Seite 78 - IC White made the following statement: The reader will understand that the top of the Chemung has been fixed by me in the district at the base of the lowest red bed, and that all rocks below this, down to the top of the Hamilton, will be described under the name of Chemung, since I have found it impracticable to separate the Portage from the Chemung by any well-defined characters that will apply throughout the district, although it is very probable that 800'-1,000...
Seite 13 - INTRODUCTION. By HS WILLIAMS. The investigations herein reported were begun for the purpose of ascertaining the nature of the changes in sedimentation, in fossils, and in sequence of faunas southward along the Devonian formations in the southern Appalachians. Collections were made by the senior author in southern Virginia and eastern Kentucky in 1895, and the results of the preliminary study of the fossils were reported in a paper read before the Geological Society of America in December, 1896.
Seite 49 - Rensselseria fauna, which in the northern Appalachian region have determined the division of the strata into numerous separate formations, are not universal. Future investigations probably will show that the composition of the local faunules is determined rather by environmental conditions recorded by the differing characters of the sediments than by actual epochs in their history.
Seite 79 - ... between these two zones the Chemung-Catskill . In this section are to be found the evidences which have been taken for the classification of the upper Devonian formations of central Pennsylvania in general, as given in the Second Pennsylvania report. A reference to the Prefatory Letter of Report G 7 will indicate the nature of the confusion introduced. In closing that letter the State geologist (JP Lesley) remarks: The startling fossil species of this report will therefore be regarded by the...
Seite 20 - The black shale (A3) rests unconformably on the Devonian limestone in the vicinity of Brooks. In the bed of Brooks Run, between the railroad and the wagon road, the lowest strata of the black shale lie in shallow, irregularly eroded pockets in the limestone. In some of these a thin layer of reddish clay was observed between the limestone and the undisturbed black shale. The unconformity is illustrated in the accompanying figure,. FIG. 1.— Section on Brooks Run, Bullitt County, Ky., showing unconformity...
Seite 50 - Aytmiutites vanuasemi, both listed as Marcellus species. Such facts indicate that the black shale was deposited in a thick mass in the Appalachian trough before the fauna of the Onondaga (Corniferous) formation was extinct. As the sections are followed upward, the shales become coarse and flaggy and contain faunas which in New York occupy the formations from Onondaga upward to Chemung. The formations holding similar faunas in western Kentucky and Indiana, west of the Cincinnati arch, are calcareous...
Seite 23 - S. sp. (r). 8. Athyris lamellosa (a). The blue-clay shales containing this faunule are similar in lithologic as well as faunal characters to the New Providence shale of southern Indiana, of which they are the southern continuation. The thin limestone of this section, at the top of the black shale, is of particular interest because it occupies the same stratigraphic horizon as the Rockford limestone 30 miles to the northwest, while it carries the lower "knob" (New Providence shale) fauna, which is...
Seite 86 - Bellerophon also appear in these upper faunules. But, as Doctor Kindle has already noted, throughout this whole fossiliferous zone of the Catawissa section, up to the appearance of the characteristic red sediment of the Catskills, no characteristic Chemung species have been discovered. Using the Ithaca section as a standard, the Catawissa section, up to zone 40 (by the fossils), and presumably up to the base of the red bed 43, must be correlated with the Hamilton, Genesee, and Nunda (including the...