Timing- and origin of dedolomite in upper Wappinger Group (Lower Ordovician) strata, southeastern New York

1996 ◽  
Vol 11 (1) ◽  
pp. 113-133 ◽  
Author(s):  
Baiying Guo ◽  
John E. Sanders ◽  
Gerald M. Friedman
Keyword(s):  
New York ◽  
Lower Ordovician

Cambrian–Lower Ordovician of SW Quebec–NE New York

2021 ◽  
pp. 1-32
Author(s):  
Osman Salad Hersi ◽  
Ed Landing ◽  
David Franzi ◽  
James Hagadorn
Keyword(s):  
New York ◽  
Sediment Accumulation ◽  
Early Cambrian ◽  
Geological History ◽  
Middle Cambrian ◽  
Early Ordovician ◽  
Lower Ordovician ◽  
History Of ◽  
Rodinia Supercontinent ◽  
Stratigraphic Nomenclature

ABSTRACT The Ottawa aulacogen/graben on the NE US—Canadian (SW Quebec and eastern Ontario) border is a long ENE-trending structure formed with initial late Neo proterozoic rifting of the Rodinia supercontinent. This rifting formed the active spreading arms (New York Promontory and Quebec Reentrant) along the (presently) NE margin of the new Laurentia paleocontinent, with the Ottawa aulacogen commonly regarded as a failed arm of the rifting. However, no sediment accumulation in the aulacogen is recorded until the late early Cambrian subsidence of a SE- trending belt that includes the aulacogen and its extension, the Franklin Basin, in NW Vermont. Late early Cambrian marine onlap (Altona Formation) followed by more rapid late middle Cambrian subsidence and deposition of fluviatile arkoses (Covey Hill Formation of SW Quebec and Ausable Formation/Member of eastern New York) record rapid foundering of this “failed arm.” Subsequent deposition (latest middle Cambrian–Early Ordovician) in the Ottawa aulacogen produced a vertical succession of lithofacies that are fully comparable with those of the shelf of the New York Promontory. One of the greatest challenges in summarizing the geological history of the Ottawa aulacogen is the presence of a duplicate stratigraphic nomenclature with lithostratigraphic names changing as state and provincial borders are crossed.

Fauna of the lower Beauharnois Formation (Beekmantown Group, Lower Ordovician), Grande-Île, Quebec

1996 ◽  
Vol 33 (8) ◽  
pp. 1132-1153 ◽  
Author(s):  
Sylvain Desbiens ◽  
Thomas E. Bolton ◽  
Alexander D. McCracken
Keyword(s):  
New York ◽  
Head Group ◽  
Faunal Assemblage ◽  
Lower Ordovician ◽  
Assemblage Zone

Lenses of bioclastic packstone and grainstone within the lower dolomite sequence of the Ogdensburg Member, Beauharnois Formation (Beekmantown Group, Lower Ordovician), in the Valleyfield region, Quebec, bear a distinct diverse faunal assemblage. This Isoteloides–Goniotelina–Ribeiria assemblage is characterized by brachiopods Finkelnburgia armanda (Billings) and Finkelnburgia cullisoni Ulrich and Cooper, molluscs Ribeiria calcifera Billings, "Maclurites" affinis (Billings), and Ceratopea canadensis (Billings), and trilobites Isoteloides canalis (Whitfield), Isoteloides peri Fortey, Bolbocephalus convexus (Billings), Goniotelina subrectus (Bradley), Strigigenalis caudata (Billings), and Hystricurus conicus (Billings). Precise correlation of this lower Beauharnois megafauna is with the Strigigenalis caudata Zone of the Catoche Formation, Cassinian Stage, of western Newfoundland, the Oxford Formation of southeastern Ontario, the Fort Cassin Formation, Cassinian Stage, Canadian Series of New York–Vermont, and the Ross–Hintze trilobite Zone G2 of Utah, Upper Ibexian Series (Tulean Stage). Conodonts include Acodus comptus (Branson and Mehl), Acodus delicatus (Branson and Mehl), Colaptoconus emarginatus (Barnes and Tuke), Colaptoconus quadraplicatus (Branson and Mehl), Scolopodus subrex Ji and Barnes, Drepanoistodus angulensis (Harris), and Oepikodus communis (Ethington and Clark). This fauna corresponds to the Oepikodus communis–"Microzarkodina" marathonensis Zone, which has its lowest limit above the middle of Zone G2 in the Ibex area of Utah. In western Newfoundland, the fauna correlates with the Oepikodus communis – Protoprioniodus simplicissimus Assemblage Zone of the Catoche Formation, and the Prioniodus elegans and Oepikodus evae zones in the Cow Head Group.

Trilobites of the Lower Ordovician (Ibexian) Fort Cassin Formation, Champlain Valley region, New York State and Vermont

1996 ◽  
Vol 70 (3) ◽  
pp. 408-427 ◽  
Author(s):  
Kevin D. Brett ◽  
Stephen R. Westrop
Keyword(s):  
New York ◽  
New York State ◽  
York State ◽  
Lower Ordovician ◽  
Low Diversity ◽  
Eleven Species

The Lower Ordovician (Ibexian) Fort Cassin Formation of New York State and Vermont consists mainly of carbonates that were deposited in a subtidal storm-influenced setting. The low diversity trilobite fauna is dominated overwhelmingly by the isoteline, Isoteloides. Eleven species representing at least nine genera are described; Acidiphorus whittingtoni is new. The bathyurine genus Goniotelina Whittington and Ross is regarded as paraphyletic and is synonymized with Acidiphorus Raymond. The presence of Isoteloides canalis (Whitfield; = I. latimarginatus Fortey), I. peri Fortey and Bathyurellus platypus Fortey indicates a correlation of the Fort Cassin with the Strigigenalis caudata Zone of the Catoche Formation of western Newfoundland.

Conodonts, stratigraphy, and relative sea-level changes of the Tribes Hill Formation (Lower Ordovician, east-central New York)

1996 ◽  
Vol 70 (4) ◽  
pp. 656-680 ◽  
Author(s):  
Ed Landing ◽  
Stephen R. Westrop ◽  
Leanne A. Knox
Keyword(s):  
New York ◽  
New Species ◽  
Sea Level ◽  
New Genus ◽  
Depositional Environments ◽  
Half Cycle ◽  
Sea Level Changes ◽  
Depositional Sequence ◽  
Layer Cake ◽  
Lower Ordovician

Tremadocian onlap is recorded by the Tribes Hill Formation. The formation is a lower Lower Ordovician (upper conodont Fauna B Interval(?)-Rossodus manitouensis Zone) depositional sequence that unconformably overlies the Upper Cambrian Little Falls Formation.Depositional environments and stratigraphy indicate that the Tribes Hill was deposited on a wave-, not tide-, dominated shelf and that a uniform, “layer-cake” stratigraphy is present. The deepening-shoaling sequence of the Tribes Hill includes the: 1) Sprakers Member (new; peritidal carbonate and overlying tempestite limestone and shale); 2) Van Wie Member (new; subtidal shale and limestone); 3) Wolf Hollow Member (revised; massive carbonates with thrombolitic cap); and 4) Canyon Road Member (new; glauconitic limestone and overlying evaporitic dolostone). The shoaling half-cycle of the Tribes Hill is older than a shoaling event in western Newfoundland, and suggests epeirogenic factors in earliest Ordovician sea-level change in east Laurentia. Conodont and trilobite biofacies track lithofacies, and Rossodus manitouensis Zone conodonts and Bellefontia Biofacies trilobites appear in the distal, middle Tribes Hill Formation.Twenty-four conodont species are illustrated. Ansella? protoserrata new species, Iapetognathus sprakersi new species, Leukorhinion ambonodes new genus and species, and Laurentoscandodus new genus are described.

Cephalopods and paleoenvironments of the Fort Cassin Formation (upper Lower Ordovician), eastern New York and adjacent Vermont

2009 ◽  
Vol 83 (5) ◽  
pp. 664-693 ◽  
Author(s):  
Björn Kröger ◽  
Ed Landing
Keyword(s):  
New York ◽  
Carbonate Platforms ◽  
Absolute Abundance ◽  
Depositional Sequence ◽  
Reef Facies ◽  
Shallow Marine ◽  
Early Ordovician ◽  
Lower Ordovician ◽  
Evolutionary Radiation ◽  
Near Shore

The dramatic late Early Ordovician radiation of cephalopods on tropical paleocontinents is illustrated by the diverse fauna (21 genera, 30 species) of the Fort Cassin Formation (Floian and lower Blackhillsian Stage) in northeast Laurentia. Cephalopods occur through the thin (ca. 30–65 m) depositional sequence of the Fort Cassin but are most common and diverse in mollusk-rich, trilobite-poor parts of the formation that characterize the thrombolite-bearing intervals in the shoaling part of the highstand systems tract. This lithofacies-biofacies linkage persists from the Tribes Hill and Rochdale Formations (lower and lower upper Tremadocian, and upper Skullrockian and Stairsian Stages, respectively), and suggests that the Early Ordovician radiations of cephalopods took place in shallow-marine, thrombolite reef facies of tropical carbonate platforms. These habitats differed strongly from the near-shore, peritidal habitats of the older Cambrian evolutionary radiation. Genus-level diversity and absolute abundance changed little through the Skullrockian-Blackhillsian, but morphologic diversity and body size increased dramatically by the late Early Ordovician. The morphological diversification suggests cephalopods diversified into a wider variety of macropredators and more complex late Early Ordovician ecosystems. Anrangeroceras whitehallense n. gen. and n. sp. is proposed. The following are emended: the Protocycloceratidae, Centrotarphyceras and C. seelyi, Protocycloceras and P. lamarcki, and Rudolfoceras cornuoryx. The following are indeterminate and abandoned: Baltoceras? pusillum Ruedemann, 1906; Comeroceras annuliferum Flower, 1941; Cyptendoceras whitfieldi Ulrich et al., 1944; Endoceras? champlainense Ruedemann, 1906; Wolungoceras valcourense Flower, 1964. Beekmanoceras Ulrich and Foerste, 1936 is a gastropod.

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