“…Of the species described in this work, Lophospira perangulata, which is known from the Ordovician of the Narwhale Sound Formation and Cape Calhoun of Greenland (Troedsson, 1928;Rohr et al, 2015), has the widest geographic distribution in North America. In Canada, the species has been documented in the province of Ontario in the Gull River, Bobcaygeon, Verulam, Lindsay, Lowville, and Watertown formations (Wilson, 1951;Liberty, 1969;Steele and Sinclair, 1971;Rohr et al, 2004), and in the province of Quebec from the Ordovician Mingan, Chaumont, and Aylmer formations, among others (Okulitch, 1935;Twenhofel, 1938;Wilson, 1951).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…acuminatus ; Rohr and Measures, p. 289, fig. 5.19–5.21.2015 Maclurites acuminatus ; Rohr et al, p. 798, fig. 3A–C.Figure 3. Maclurites acuminatus (Billings, 1865) and ?…”
Section: Systematic Paleontologymentioning
confidence: 99%
“…Although Hormotoma spp. is widely distributed through the Ordovician (Cullison, 1938; Wilson, 1951; Rohr et al, 2015), the rest of the taxa are indicative of the Lower–Middle Ordovician: Lophospira perangulata is a common Lower–Middle Ordovician species in North America (Rohr, 1996), ranging from Darriwilian to Sandbian (Whiterockian, Mohawkian); Monitorella extends from the Dapingian to the lower Sandbian (Whiterockian) in Nevada (Rohr, 1996); and Maclurites acuminatus and Malayaspira rugosa are distributed from the Floian to the Darriwilian (Ibexian, Whiterockian) in North America, Argentina, and Indonesia (Kobayashi, 1959; Ross and Longwell, 1964; Rohr, 1994; Rohr et al, 2001 Rohr and Measures, 2001; Bertero, 2009; Rohr et al, 2015). Finally, Lecanospira is mainly distributed from the Lower–Middle Ordovician (Tremadocian, Darriwilian).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…The Ordovician gastropod faunas studied in this work have a wide geographic distribution in North America. Maclurites acuminatus has been described from the Ordovician Norwhale Sound Formation of Greenland (Rohr et al, 2015), the Ordovician Table Point Formation of Newfoundland, Canada (Boyce and Knight, 2009), and the Ordovician Fort Cassin Formation in Vermont, USA (Whitfield, 1890).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…-Rohr et al (2015) established that the main characteristics that identify Maclurites acuminatus are its base, narrow apical cavity, and absence of previous whorls visible within the apical cavity. The Mexican species is similar to Maclurites acuminatus from the Narwhale Sound Formation of the Hudson Land of the Ordovician (Ibexian) from Greenland, in terms of the base and the narrow apical cavity, but differs in size, since the Mexican specimen has a larger diameter (2.5 cm, USDG 390) compared to the Greenland specimen (1.5 cm) (Rohr et al, 2015). The Mexican specimen is comparable with Maclurites sp.…”
The Lower–Middle Ordovician (Ibexian, Whiterockian) sedimentary rocks exposed at Rancho Las Norias includes the informally named Las Norias formation, which consists of an intercalation of carbonate and clastic sediments with abundant marine fauna. These deposits occur as the most austral sedimentary rocks of Ordovician age for Laurentia, providing a critical link to understand the distribution of Ordovician marine faunas of North America. An investigation of the gastropod fauna from the upper portion of the Las Norias formation, Sonora, Mexico, is undertaken for the first time. The gastropod assemblage includes Maclurites acuminatus, ?Monitorella sp., Lecanospira sp., Malayaspira aff. M. rugosa, Lophospira perangulata, and Hormotoma? sp. This assemblage indicates a paleogeographic relationship with Laurentia, including the USA (Nevada), Canada (British Columbia, Newfoundland), Greenland, and the Argentine Precordillera.
“…Of the species described in this work, Lophospira perangulata, which is known from the Ordovician of the Narwhale Sound Formation and Cape Calhoun of Greenland (Troedsson, 1928;Rohr et al, 2015), has the widest geographic distribution in North America. In Canada, the species has been documented in the province of Ontario in the Gull River, Bobcaygeon, Verulam, Lindsay, Lowville, and Watertown formations (Wilson, 1951;Liberty, 1969;Steele and Sinclair, 1971;Rohr et al, 2004), and in the province of Quebec from the Ordovician Mingan, Chaumont, and Aylmer formations, among others (Okulitch, 1935;Twenhofel, 1938;Wilson, 1951).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…acuminatus ; Rohr and Measures, p. 289, fig. 5.19–5.21.2015 Maclurites acuminatus ; Rohr et al, p. 798, fig. 3A–C.Figure 3. Maclurites acuminatus (Billings, 1865) and ?…”
Section: Systematic Paleontologymentioning
confidence: 99%
“…Although Hormotoma spp. is widely distributed through the Ordovician (Cullison, 1938; Wilson, 1951; Rohr et al, 2015), the rest of the taxa are indicative of the Lower–Middle Ordovician: Lophospira perangulata is a common Lower–Middle Ordovician species in North America (Rohr, 1996), ranging from Darriwilian to Sandbian (Whiterockian, Mohawkian); Monitorella extends from the Dapingian to the lower Sandbian (Whiterockian) in Nevada (Rohr, 1996); and Maclurites acuminatus and Malayaspira rugosa are distributed from the Floian to the Darriwilian (Ibexian, Whiterockian) in North America, Argentina, and Indonesia (Kobayashi, 1959; Ross and Longwell, 1964; Rohr, 1994; Rohr et al, 2001 Rohr and Measures, 2001; Bertero, 2009; Rohr et al, 2015). Finally, Lecanospira is mainly distributed from the Lower–Middle Ordovician (Tremadocian, Darriwilian).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…The Ordovician gastropod faunas studied in this work have a wide geographic distribution in North America. Maclurites acuminatus has been described from the Ordovician Norwhale Sound Formation of Greenland (Rohr et al, 2015), the Ordovician Table Point Formation of Newfoundland, Canada (Boyce and Knight, 2009), and the Ordovician Fort Cassin Formation in Vermont, USA (Whitfield, 1890).…”
Section: Age and Distribution Of The Gastropod Faunamentioning
confidence: 99%
“…-Rohr et al (2015) established that the main characteristics that identify Maclurites acuminatus are its base, narrow apical cavity, and absence of previous whorls visible within the apical cavity. The Mexican species is similar to Maclurites acuminatus from the Narwhale Sound Formation of the Hudson Land of the Ordovician (Ibexian) from Greenland, in terms of the base and the narrow apical cavity, but differs in size, since the Mexican specimen has a larger diameter (2.5 cm, USDG 390) compared to the Greenland specimen (1.5 cm) (Rohr et al, 2015). The Mexican specimen is comparable with Maclurites sp.…”
The Lower–Middle Ordovician (Ibexian, Whiterockian) sedimentary rocks exposed at Rancho Las Norias includes the informally named Las Norias formation, which consists of an intercalation of carbonate and clastic sediments with abundant marine fauna. These deposits occur as the most austral sedimentary rocks of Ordovician age for Laurentia, providing a critical link to understand the distribution of Ordovician marine faunas of North America. An investigation of the gastropod fauna from the upper portion of the Las Norias formation, Sonora, Mexico, is undertaken for the first time. The gastropod assemblage includes Maclurites acuminatus, ?Monitorella sp., Lecanospira sp., Malayaspira aff. M. rugosa, Lophospira perangulata, and Hormotoma? sp. This assemblage indicates a paleogeographic relationship with Laurentia, including the USA (Nevada), Canada (British Columbia, Newfoundland), Greenland, and the Argentine Precordillera.
Ordovician strata in Greenland are extensively exposed in North Greenland and northern East Greenland; additional small traces (loose blocks) are recorded from the craton of West Greenland. The western North Greenland succession, is nearly identical to that of the Franklinian basin exposed in Ellesmere Island, Arctic Canada; the eastern North Greenland represents the (present) northeastern corner of Laurentia and provides the connection to the East Greenland Caledonian platform. The northern East Greenland succession is the natural northern extension of the Caledonian platform of northern Europe and the Appalachian platform of eastern North America. During the Ordovician Greenland occupied a palaeogeographical subtropical to tropical position with a faunal assemblage typical of Laurentia. A prominent faunal peak of diversification occurred in the Late Ordovician. The stratigraphical succession of Greenland is summarized and age relationships are discussed with reference to the fossil faunas and breaks in the sequences and correlation between the locations and regions are provided.
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