Abstract:The Indian subcontinent remains one of the few regions of the world that lacks an established biostratigraphical framework for the Cambrian. As a step towards realizing this goal, this revision of reportedly Cambrian material previously described as hyolith from the Himalaya permits the recognition of Sulcavitus wynnei ( Other previously reported regional hyolith material is either non-hyolith, questionably assigned to the group, indeterminate or not available. The range of S. wynnei may have local biostratigr… Show more
“…This poorly preserved specimen has an incremental angle of 15° and appears to have an oxygonal aperture. Adaperturally, shallowly convex comarginal growth lines on the ventral surface are cord-like and laterally discontinuous, resembling the pattern illustrated by Malinky (1990) as Nitoricornus danianum (Matthew in Walcott, 1884) and by Kruse and Hughes (2016) as ? Crestjahitus danianus from New Brunswick, Canada, whereas the dorsal surface is ornamented with barely discernible fine growth lines.…”
Section: Systematic Paleontologysupporting
confidence: 53%
“…1.1) from New Brunswick and assigned to ? Crestjahitus danianus by Kruse and Hughes (2016). Figure 4.Articulated hyolithids from the Sirius Passet Lagerstätte, Buen Formation, Peary Land, North Greenland.…”
The recent description of the nevadioid trilobite Buenellus chilhoweensis Webster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, Tennessee. The description recognized the oldest known age-diagnostic Cambrian trilobite from the Laurentian margin of the former Iapetus Ocean since Buenellus Blaker, 1988 is known otherwise only from the Sirius Passet Lagerstätte on the Innuitian margin of North Greenland. The bivalved arthropods Isoxys chilhoweanus Walcott, 1890 and Indota tennesseensis (Resser, 1938a) have also been described from the Murray Shale, but hyolithids appear to be the dominant body fossils in terms of diversity and abundance. Although poorly preserved, the hyolithids occurring together with Buenellus chilhoweensis are described to improve understanding of the Murray Shale biota. The hyolith assemblages of the Murray Shale and Sirius Passet Lagerstätte are not closely similar, although the poor preservation of both hinders comparison.
“…This poorly preserved specimen has an incremental angle of 15° and appears to have an oxygonal aperture. Adaperturally, shallowly convex comarginal growth lines on the ventral surface are cord-like and laterally discontinuous, resembling the pattern illustrated by Malinky (1990) as Nitoricornus danianum (Matthew in Walcott, 1884) and by Kruse and Hughes (2016) as ? Crestjahitus danianus from New Brunswick, Canada, whereas the dorsal surface is ornamented with barely discernible fine growth lines.…”
Section: Systematic Paleontologysupporting
confidence: 53%
“…1.1) from New Brunswick and assigned to ? Crestjahitus danianus by Kruse and Hughes (2016). Figure 4.Articulated hyolithids from the Sirius Passet Lagerstätte, Buen Formation, Peary Land, North Greenland.…”
The recent description of the nevadioid trilobite Buenellus chilhoweensis Webster and Hageman, 2018 established the presence of early Cambrian Montezuman Stage (Cambrian Series 2, Stage 3) faunas in the Murray Shale of Chilhowee Mountain, Tennessee. The description recognized the oldest known age-diagnostic Cambrian trilobite from the Laurentian margin of the former Iapetus Ocean since Buenellus Blaker, 1988 is known otherwise only from the Sirius Passet Lagerstätte on the Innuitian margin of North Greenland. The bivalved arthropods Isoxys chilhoweanus Walcott, 1890 and Indota tennesseensis (Resser, 1938a) have also been described from the Murray Shale, but hyolithids appear to be the dominant body fossils in terms of diversity and abundance. Although poorly preserved, the hyolithids occurring together with Buenellus chilhoweensis are described to improve understanding of the Murray Shale biota. The hyolith assemblages of the Murray Shale and Sirius Passet Lagerstätte are not closely similar, although the poor preservation of both hinders comparison.
The Indian subcontinent's biota and biostratigraphy is amongst the least well known internationally of any Cambrian succession worldwide. Recent revision of previously described type material and a substantial number of new finds reveal a typical Cambrian skeletonized fauna and an organic walled biota, as well as various trace fossils. This biota, reviewed here synoptically, currently contains 51 non-agnostoid trilobite genera belonging to 50 species; 15 genera and species of agnostoids; one species of bradoriid arthropod; 18 brachiopod genera containing 20 species; echinoderm thecal and columnal plates; a soft-bodied eldoniid; representatives of three hyolith genera; other small shelly fossils some of which are identified to species level; acritarchs; and a variety of ichnotaxa. Regional biostratigraphic zonations for trilobites, brachiopods, small shelly fossils, and trace fossils are herein combined into an integrated Cambrian biostratigraphical scheme that permits correlation along and across the lithotectonic zones of the Himalayan margin and southward onto cratonic India. These consist of 13 named
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