Upper Devonian Stromatoporoids from Redwater Reef Complex, Alberta and Southern Northwest Territories northern Alberta

1966 ◽  
Author(s):  
J E Klovan ◽  
C W Stearn
Keyword(s):  
Northwest Territories ◽  
Upper Devonian ◽  
Reef Complex ◽  
Northern Alberta

An enigmatic blastozoan echinoderm fauna from central kentucky

2009 ◽  
Vol 83 (5) ◽  
pp. 739-749 ◽  
Author(s):  
Colin D. Sumrall ◽  
Carlton E. Brett ◽  
Troy A. Dexter ◽  
Alexander Bartholomew
Keyword(s):  
North America ◽  
Northwest Territories ◽  
Middle Devonian ◽  
Fossil Record ◽  
Foreland Basin ◽  
Late Ordovician ◽  
Upper Devonian ◽  
Range Extension ◽  
First Report ◽  
Appalachian Foreland

A series of small road cuts of lower Boyle Formation (Middle Devonian: Givetian) near Waco, Kentucky, has produced numerous specimens of three blastozoan clades, including both “anachronistic” diploporan and rhombiferan “cystoids” and relatively advanced Granatocrinid blastoids. This unusual assemblage occurs within a basal grainstone unit of the Boyle Limestone, apparently recording a local shoal deposit. Diploporans, the most abundant articulated echinoderms, are represented by a new protocrinitid species, Tristomiocystis globosus n. gen. and sp. Glyptocystitoid rhombiferans are represented by isolated thecal plates assignable to Callocystitidae. Three species of blastoids, all previously undescribed, include numerous thecae of the schizoblastid Hydroblastus hendyi n. gen. and sp., the rare nucleocrinid Nucleocrinus bosei n. sp., and an enigmatic troosticrinid radial. The blastoid Nucleocrinus is typical for the age; however, the callocystitid, schizoblastid, and protocrinitid are not. Hydroblastus is the oldest known schizoblastid. Middle and Upper Devonian callocystitids have been previously reported only from Iowa and Michigan USA with unpublished reports from Missouri USA and the Northwest Territories, Canada. This occurrence is thus the first report of a Middle Devonian rhombiferan from the Appalachian foreland basin. Tristomiocystis is the first known protocrinitid in North America and the only protocrinitid younger than Late Ordovician. This occurrence thus represents a range extension of nearly 50 million years for protocrinids. This extraordinary sample of echinoderms in a Middle Devonian limestone from a well-studied area of North America highlights the incompleteness of the known fossil record, at least in fragile organisms such as echinoderms.

Monelasmina besti, a new Schizophoriid Brachiopod from the Upper Devonian of Western Canada

1959 ◽  
Vol 96 (6) ◽  
pp. 470-472 ◽  
Author(s):  
A. E. H. Pedder
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
A New Species

AbstractMonelasmina, previously known only from the Frasnian of Europe, is described and figured from the Hay River formation (Frasnian) of the Northwest Territories, Canada. The specimens are referred to a new species, M. besti.

Devonian Boring Algae or Fungi Associated with Micrite Tubules

1974 ◽  
Vol 11 (11) ◽  
pp. 1606-1610 ◽  
Author(s):  
David R. Kobluk ◽  
Michael J. Risk
Keyword(s):  
Upper Devonian ◽  
Western Canada ◽  
Reef Complex

The process of skeletal micritization by boring thallophytes (algae and fungi) is known from modern carbonate environments and probably occurred as far back as the Ordovician. Boring thallophytes, probably fungi, possibly algae, were the cause of at least some skeletal micritization in Devonian reef complexes in western Canada. In situ endolithic filaments, of 3 μm and 5 μm diameter, occur associated with a micrite rim and micrite tubules in the corallite of an Upper Devonian tetracoral from the Miette reef complex. The filaments are found in the micrite rim around the coral, in the micrite tubules, and in unmicritized parts of the corallite, often oriented normal to the corallite wall and with the same trend as the tubules. Infestation and micritization began well before the corallite was buried, probably while the coral was alive, and continued for some time after death.

Facies variations in the Devonian limestones of eastern South Devon

1977 ◽  
Vol 114 (3) ◽  
pp. 165-193 ◽  
Author(s):  
Colin T. Scrutton
Keyword(s):  
Carbonate Platform ◽  
Upper Devonian ◽  
The Other ◽  
Reef Complex ◽  
Lithostratigraphic Units ◽  
Platform Margin ◽  
Barrier Reefs

SummaryThe Middle and Upper Devonian limestone successions at Torquay and in the Lemon Valley SW of Newton Abbot are described. Lithostratigraphic units are proposed for the Torquay succession. The compositions of the coral faunas in both successions are outlined and contribute, together with the other available faunal evidence, towards a broad internal dating of these limestone sequences. Successions elsewhere in the limestones of eastern South Devon are briefly outlined. On the basis of this evidence facies variations from the margin towards the centre of the carbonate platform in eastern South Devon are demonstrated and interpreted as reflecting the development of barrier reefs along parts at least of the platform margin in Givetian times. The character of the reef-complex, named the Tor Bay Reef-Complex, is briefly compared with Devonian reefs elsewhere.

Fore-reef carbonate mud bioherms and associated reef margin, Upper Devonian, Ancient Wall reef complex, Alberta

1978 ◽  
Vol 15 (8) ◽  
pp. 1304-1325 ◽  
Author(s):  
Eric W. Mountjoy ◽  
Robert K. Jull
Keyword(s):  
Upper Devonian ◽  
Calcareous Algae ◽  
Fore Reef ◽  
Reef Complex ◽  
Frame Building ◽  
Water Conditions ◽  
Carbonate Sequence ◽  
Depositional Cycle ◽  
Coral Bioherms

The upper Peechee Member of the Ancient Wall reef complex that is well exposed on the southeast margin of Mount Haultain represents the end of the first main depositional cycle of this complex. The uppermost part forms a 15–30 m thick carbonate sequence that extends basinward over deeper water fore-reef detritus and is divisible into three distinct layers: the lower two consist mainly of stromatoropoid and coral bioherms and biostromes and associated calcarenites and calcilutites; the uppermost consists of five small micrite and wackestone bioherms 7.5–22 m long and 4–6 m high; three of these grew around and on top of a 30 m wide stromatoporoid–coral biostrome. Frame-building organisms include laminar and hemispherical colonies of Phillip-sastrea, renalcid algae (often associated with small fenestral cavities), encrusting calcareous algae (Sphaerocodium), and laminar stromatoporoids. Renalcid encrustations of micrites and wackestones on the vertical sides and undersides of bioherms indicate that early submarine cementation was also significant in forming these rigid structures. The bioherms formed during deepening water conditions with agitation and bioerosion too gentle to apron them with detritus but sufficient to fragment and disorient fragile skeletal elements. The sharp contacts and the lack of interfingering with basin strata indicate that the bioherms were drowned before burial by basin calcareous shales.

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