Abstract:Stromatoporoids are the major fossil faunal element of the Upper Limestone Member of the Keyser Formation in an outcrop at Mustoe, Virginia. The member is divided into four subunits at Mustoe, in ascending order: a bioherm, two biostromes, and a laminated micritic subunit. Stromatoporoids are found in all subunits, and they decrease in quantity upward. Nine species are described in three genera: Plexodictyon cf. P. waparksi Stearn, Parallelostroma typicum (Rosen), P. kaugatomicum (Riabinin), P. barretti (Girty… Show more
“…P . barretti (Girty, 1895) by Stock and Holmes (1986). Figure 2.Stratigraphy of the Keyser Formation and adjacent strata at Mustoe, Virginia.…”
Section: Geography and Stratigraphymentioning
confidence: 99%
“…Lower Devonian (Lochkovian) stromatoporoids have been described from several areas of North America, where in many cases they are highly abundant. These include those from New York (Stock, 1991, 1997), Virginia (Stock and Holmes, 1986), and Bathurst Island, Arctic Canada (Stearn, 1990). Additional previously undescribed stromatoporoid faunas are also present in Maine and Ellesmere Island, Arctic Canada.…”
Three species of Habrostroma dominate stromatoporoid faunas in the Lower Devonian (Lochkovian) of five areas in North America: New York, Virginia, Maine, Bathurst Island, and Ellesmere Island. In addition, they occur in what could be the upper Silurian (uppermost Pridoli) of Virginia, and possibly New York. Measurements of nine morphologies from 127 specimens of Habrostroma were subjected to an average linkage cluster analysis. Using average linkage between groups, three distinct clusters were revealed. Group assignments made from the cluster analysis were saved, and entered into a canonical discriminant analysis with the nine morphological variables. An overall Wilks’ lambda was calculated, and is statistically significant at alpha <0.001. The hit rate for classifying group 1 is 98%, that for group 2 is 100%, and that for group 3 is 97.9%; the total hit rate is 100%. The morphological variables contributing most to group membership are: (1) percent cystlike microlaminae, (2) microlaminae per mm, (3) gallery height, (4) laminae per mm, and (5) laminar thickness. The statistics confirm that there are three species: H. centrotum, H. microporum, and H. consimile.Habrostroma centrotum occurs in all five areas. This is unusual because Virginia, New York, and Maine are part of the Eastern Americas Realm, and the arctic islands are part of the Old World Realm. Separation of the realms is based on a high percentage of unique genera in each. A breach in the inter-realm barrier is proposed to have existed across the Canadian Shield during the Lochkovian. The nature of the breach is determined to be a shallow-water filter, allowing the passage of a limited number of taxa.
“…P . barretti (Girty, 1895) by Stock and Holmes (1986). Figure 2.Stratigraphy of the Keyser Formation and adjacent strata at Mustoe, Virginia.…”
Section: Geography and Stratigraphymentioning
confidence: 99%
“…Lower Devonian (Lochkovian) stromatoporoids have been described from several areas of North America, where in many cases they are highly abundant. These include those from New York (Stock, 1991, 1997), Virginia (Stock and Holmes, 1986), and Bathurst Island, Arctic Canada (Stearn, 1990). Additional previously undescribed stromatoporoid faunas are also present in Maine and Ellesmere Island, Arctic Canada.…”
Three species of Habrostroma dominate stromatoporoid faunas in the Lower Devonian (Lochkovian) of five areas in North America: New York, Virginia, Maine, Bathurst Island, and Ellesmere Island. In addition, they occur in what could be the upper Silurian (uppermost Pridoli) of Virginia, and possibly New York. Measurements of nine morphologies from 127 specimens of Habrostroma were subjected to an average linkage cluster analysis. Using average linkage between groups, three distinct clusters were revealed. Group assignments made from the cluster analysis were saved, and entered into a canonical discriminant analysis with the nine morphological variables. An overall Wilks’ lambda was calculated, and is statistically significant at alpha <0.001. The hit rate for classifying group 1 is 98%, that for group 2 is 100%, and that for group 3 is 97.9%; the total hit rate is 100%. The morphological variables contributing most to group membership are: (1) percent cystlike microlaminae, (2) microlaminae per mm, (3) gallery height, (4) laminae per mm, and (5) laminar thickness. The statistics confirm that there are three species: H. centrotum, H. microporum, and H. consimile.Habrostroma centrotum occurs in all five areas. This is unusual because Virginia, New York, and Maine are part of the Eastern Americas Realm, and the arctic islands are part of the Old World Realm. Separation of the realms is based on a high percentage of unique genera in each. A breach in the inter-realm barrier is proposed to have existed across the Canadian Shield during the Lochkovian. The nature of the breach is determined to be a shallow-water filter, allowing the passage of a limited number of taxa.
“…8a, b, f), further indicates high-temperature diagenesis at depth (Smosna 1984;Dorobek 1987). Because of patchy but pervasive dolomitization at the Water Sinks, internal morphologic details of skeletal material was significantly reduced, thereby preventing species-level identification of stromatoporoids like that done at Mustoe reef (Smosna 1984;Stock and Holmes 1986).…”
Section: Facies Analysis Of Stromatoporoid Buildupsmentioning
confidence: 99%
“…A well-developed bioherm is present in the upper of these two horizons at Mustoe. The paleoecology (Smosna and Warshauer 1979), stromatoporoid systematics (Stock and Holmes 1986), geologic setting (Dorobek and Read 1986), and diagenetic history (Smosna 1984) of this buildup, which is known as the Mustoe reef, have been described. This buildup at Mustoe is classified as a true ecological reef, and it represents one of the oldest stromatoporoid reefs known from anywhere in the Appalachian Basin (Smosna and Warshauer 1979;Precht 1988).…”
composition as the buildup grew. The results of this study provide unique insight into reef development in one of the oldest Silurian reefal buildups from the central Appalachian Basin during a time interval when reefal buildups were poorly represented.
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