Also known as Schizophoria-Howellella Community.
Where: Nunavut, Canada (73.5° N, 100.0° W: paleocoordinates 2.2° S, 30.2° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Lochkovian (419.2 - 410.8 Ma)
• Unnamed formation.
• bed-level stratigraphic resolution
Environment/lithology: open shallow subtidal; shelly/skeletal, gray lime mudstone and shelly/skeletal, gray wackestone
• Deposits in this region are of two general kinds: shallow-water stable carbonate platform (generally in the NW part of Arctic Archipelago) and deeper basinal facies (generally to the SE). This collection is in the former. This is in Smith's Schizophoria-Howellella Community, which he places in the third of six zones from nearshore to offshore, between shallow and deep subtidal, below wave base. "This community sppears to have occupied a shallower, rougher water position than the Hebetoechia Community, as evidenced by the disarticulation of the valves, common echinoderm fragments, coral and algal material." See also lithology description.
•SEP environmental call based on given info and regional context
• Section in general: "...contains, in the lower part, thin-bedded, highly argillaceous lime-mudstone with angular quartz silt. The upper part contains cleaner, well-washed, thin to medium-bedded lime packstone to grainstone with common to abundant oncolites, many of which have a valve fragment of Schizophoria as the centre. The oncolites suggest an environment of clean, shallow water of higher energy than the underlying units, which do not possess oncolites. The changes upward in this section suggest a shallowing, higher energy environemnt." For this unit: "Lime mudstone-wackestone: thin to medium bedded, fairly lenticular, blocky; medium dark grey, weathering medium grey-brown; well indurated, fetid, fractured; almost a coquina of brachiopods in places..."
Reposited in the GSC
• Smith gives specimen counts.
Primary reference: R. E. Smith. 1980. Lower Devonian (Lochkovian) biostratigraphy and brachiopod faunas, Canadian arctic islands. Geological Survey of Canada Bulletin 308:1-155 [M. Foote/M. Foote/P. Wagner]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 26472: authorized by Michael Foote, entered by Michael Foote on 16.10.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
• Focus of the entire monograph is on brachiopods. Other taxa mentioned but not necessarily listed in detail.
Show authors, comments, and common names
| Strophomenata |
| Strophomenida - Amphistrophiidae |
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| Orthotetida - Chilidiopsidae |
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| Rhynchonellata |
| Spiriferida - Delthyrididae |
|
| Rhynchonellida - Hebetoechiidae |
|
| Orthida - Schizophoriidae |
|
| Athyridida - Athyrididae |
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| Conodonta |
| Ozarkodinida - |
|