Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Robert J. Horodyski"'
Autor:
Julia M. G. Miller, Robert J. Horodyski, Chester T. Wrucke, John H. Stewart, Donald P. Elston, Don Winston, Robert C. Pearson, Anthony R. Prave, Lauren A. Wright, Nicholas Christie-Blick, William J. Devlin, Paul K. Link, Marjorie Levy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cad585ba98cd5440854bd95c312ec1ae
https://doi.org/10.1130/dnag-gna-c2.463
https://doi.org/10.1130/dnag-gna-c2.463
Autor:
Robert J. Horodyski
Publikováno v:
Precambrian Research. 61:241-278
Proterozoic black shales and other fine-grained siliciclastic rocks contain a variety of fossils. These fossils are illustrated by examples from three Proterozoic units in the western USA—the Belt Supergroup (Middle Proterozoic), the Chuar Group (L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e6b68a17f1ad042c8f04cbcbd79500c
https://doi.org/10.1016/0301-9268(93)90116-j
https://doi.org/10.1016/0301-9268(93)90116-j
Autor:
Knauth Lp, Robert J. Horodyski
Publikováno v:
Science (New York, N.Y.). 263(5146)
Microfossils have been discovered in cavity-fill and replacement silica that occurs between chert-breccia clasts in 1200-million-year-old paleokarst at the top of the Mescal Limestone, central Arizona, and in ∼800-million-year-old paleokarst at the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ecb1f7ec51e3a92a0fdd8355557207bf
https://pubmed.ncbi.nlm.nih.gov/17754880
https://pubmed.ncbi.nlm.nih.gov/17754880
Autor:
Toby B. Moore, Carl Victor Mendelson, Robert J. Horodyski, John Bauld, J. William Schopf, Jere H. Lipps
This Chapter considers the preserved, known record of Proterozoic and selected Early Cambrian microfossils: the microbiology of the middle eon of earth history. The evolutionary changes (evidenced morphologically) that took place during the Proterozo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18b27c8b8f4cde99b25a55204af8ff0e
https://doi.org/10.1017/cbo9780511601064.007
https://doi.org/10.1017/cbo9780511601064.007
Publikováno v:
Canadian Journal of Earth Sciences. 17:1166-1173
An assemblage of filamentous microfossils is preserved in black shales of the approximately 1.2 Ga old Dismal Lakes Group from a locality about 110 km west-southwest of Coppermine, Northwest Territories, Canada. These microfossils occur as empty, 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63b789dc55f3bf61b3c016be93084bd8
https://doi.org/10.1139/e80-123
https://doi.org/10.1139/e80-123
Autor:
Robert J. Horodyski
Publikováno v:
Precambrian Research. 3:517-536
Calcareous stromatolites of the upper Siyeh Limestone (ca. 1.1 ∘ 10 9 years old) were studied in the central part of Glacier National Park, Montana. The stromatolites, mound- and dome-shaped structures deposited in a shallow, generally submerged, t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e59a26daa39e6c1bf32748e6662705c9
https://doi.org/10.1016/0301-9268(76)90016-4
https://doi.org/10.1016/0301-9268(76)90016-4
Autor:
Robert J. Horodyski
Publikováno v:
Precambrian Research. 16:143-154
Pseudomicrofossils and authentic microfossils occur in the approximately 1.3 Ga-old Appekunny Argillite, lower Belt Supergroup, Glacier National Park, Montana. These microstructures occur in finely-laminated, dark gray and black mudstones that were d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::acc1b1ab1c6d87f29de413366a5cf7f8
https://doi.org/10.1016/0301-9268(81)90009-7
https://doi.org/10.1016/0301-9268(81)90009-7
Autor:
David M. Ward, N. Robinson, Simon C. Brassell, Geoffrey Eglinton, Robert J. Horodyski, Roger E. Summons, Evan Evans
Publikováno v:
Geochimica et Cosmochimica Acta. 52:2625-2637
Abundant extractable hydrocarbons, in association with well preserved kerogen, have been recognised in a dolostone from the Chuar Group (approx. 850 Ma). The biomarkers present include C15-C30, acyclic isoprenoids, C26-C28 steranes, C27-C35 hopanes a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52e6c64429361bd767f6b65673499767
https://doi.org/10.1016/0016-7037(88)90031-2
https://doi.org/10.1016/0016-7037(88)90031-2
Publikováno v:
Canadian Journal of Earth Sciences. 22:758-767
Spheroidal and filamentous organic-walled microfossils have been detected in ca. 1.7 Ga old cherts of the Hornby Bay Group, Northwest Territories, Canada. The majority of the spheroidal forms range from 1 to 4 μm in diameter, are referable to the ge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74b9ffdffe756bcb868770d5e13fb1bc
https://doi.org/10.1139/e85-080
https://doi.org/10.1139/e85-080
Autor:
Robert J. Horodyski
Publikováno v:
Sedimentology. 29:285-289
Irregular, low relief bedding-plane markings which probably represent impressions of thin, wrinkled algal mats have recently been detected in mudstones from the 1100 m.y. old Snowslip Formation, Belt Supergroup, Glacier National Park, Montana. Algal-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a92f48298be39aad151107923e9567a
https://doi.org/10.1111/j.1365-3091.1982.tb01725.x
https://doi.org/10.1111/j.1365-3091.1982.tb01725.x