Abstract:Conodont faunas from the uppermost part of the Coils Creek Member of the McColley Canyon Formation and primarily the lower part of the Denay Limestone (Middle Devonian, Eifelian) from the northern Roberts Mountains and adjacent central Nevada areas are the subjects of the present study. Four new species from the Denay Limestone (Eifelian, <i>costatus </i>and <i>australis </i>zones) are described herein: <i>Polygnathus salixensis </i>sp. nov., <i>P. holynensis </i>… Show more
“…The dark shaly mudstone succession is overlain by shales of the Huergas Formation, of Eifelian and early Givetian age (Hofmann & Keller, 2006). It should be noted that the full names of the costatus and partitus zones have changed because Vodrážková et al (2011) …”
The Santa Lucía Formation represents the major phase in Devonian reef development of the Cantabrian Zone (Cantabrian Mountains, northwest Spain). In the present study the transition from the carbonate platform deposits of the Santa Lucía Formation to the overlying euxinic basinal deposits of the Huergas Formation is described. These transitional strata are connected to the Basal Choteč Event and represent a condensed sedimentation of micritic dark-grey and black limestones with an upward increase of dark shale intercalations with iron mineralisation surfaces and storm-induced brachiopod coquinas. The transitional beds are grouped into a new unit, the Cabornera Bed, which consists of limestone, limestone-shale and shale facies associations, representing a sediment-starved euxinic offshore area just below the storm wave base. Four stages in reef decline can be recognised: a reef stage, an oxygen-depleted, nutrient-rich stage, a siliciclastic-influx stage and a pelagic-siliciclastic stage. Additional geochemical and geophysical investigations are needed to verify the results presented herein.
“…The dark shaly mudstone succession is overlain by shales of the Huergas Formation, of Eifelian and early Givetian age (Hofmann & Keller, 2006). It should be noted that the full names of the costatus and partitus zones have changed because Vodrážková et al (2011) …”
The Santa Lucía Formation represents the major phase in Devonian reef development of the Cantabrian Zone (Cantabrian Mountains, northwest Spain). In the present study the transition from the carbonate platform deposits of the Santa Lucía Formation to the overlying euxinic basinal deposits of the Huergas Formation is described. These transitional strata are connected to the Basal Choteč Event and represent a condensed sedimentation of micritic dark-grey and black limestones with an upward increase of dark shale intercalations with iron mineralisation surfaces and storm-induced brachiopod coquinas. The transitional beds are grouped into a new unit, the Cabornera Bed, which consists of limestone, limestone-shale and shale facies associations, representing a sediment-starved euxinic offshore area just below the storm wave base. Four stages in reef decline can be recognised: a reef stage, an oxygen-depleted, nutrient-rich stage, a siliciclastic-influx stage and a pelagic-siliciclastic stage. Additional geochemical and geophysical investigations are needed to verify the results presented herein.
“…Rarity of vertebrates in the Monitor Range and their absence in the Toquima Range indicate they were not present, or at least not preserved, in the outer shelf environment. Figure 1 Maps showing the location of Willow Creek sections. ( 1 ) General locality map after Vodrážková et al (2011, fig. 1), inset showing Eureka county in Nevada; ( 2 ) topographic map of the Willow Creek area (WC box in [ 1 ]) after Murphy and Gronberg (1970, fig.…”
Fossil fish are poorly represented in middle Lower Devonian deposits of the western United States. Here we describe vertebrate microremains from mid-Pragian levels in the Kobeh Member, McColley Canyon Formation, central Nevada. The species diversity of the assemblages is low and dominated by the acanthodian Nostolepis costata Goujet, 1976. This species is found in older (late Lochkovian–early Pragian) deposits in France and Spain and mid-Pragian or slightly younger deposits in Saudi Arabia. This distribution suggests dispersal to the west from the Armorica terrane around the south of Laurussia to the Nevada region, and southeastward to Arabia, on the northern margin of Gondwana.
“…cooperi cooperi Klapper, 1971, and recognized the Upper patulus Zone (now partitus Zone), which subsequently defined the Emsian-Eifelian boundary. Vodrážková et al (2011) granted Po. patulus and Po.…”
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