Lamottia (Favositida, Tabulata) from the Decorah Formation (Kirkfieldian, Ordovician) of Iowa

1988 ◽  
Vol 62 (3) ◽  
pp. 424-426
Author(s):  
Jeffrey C. Edwards
Keyword(s):  
New York ◽  
Thin Section ◽  
Geographic Range ◽  
Upper Ordovician ◽  
North Central ◽  
The North ◽  
Tabulate Coral ◽  
Longitudinal Pattern ◽  
Stratigraphic Range ◽  
Diagenetic Feature

The early tabulate coral Lamottia heroensis has been identified from the Ion Member of the Decorah Formation (Upper Ordovician) in northeast Iowa. This extends the stratigraphic range of this species upward from Lower Chazyan to Kirkfieldian, and extends the geographic range from the Vermont-New York border area to include the north-central Midcontinent. Thin section and SEM studies strongly support the contention that the longitudinal pattern of alternating light and dark bands observed in corallite walls reflects a primary structural grain rather than a secondary diagenetic feature.

Katian (Late Ordovician) conodonts on the northwestern margin of the North China Craton

2021 ◽  
pp. 1-22
Author(s):  
Zhihua Yang ◽  
Xiuchun Jing ◽  
Hongrui Zhou ◽  
Xunlian Wang ◽  
Hui Ren ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Late Ordovician ◽  
Carbonate Platforms ◽  
Upper Ordovician ◽  
The North ◽  
Low Latitudes ◽  
Northwestern Margin ◽  
Conodont Fauna ◽  
Stratigraphic Range

Abstract Upper Ordovician strata exposed from the Baiyanhuashan section is the most representative Late Ordovician unit in the northwestern margin of the North China Craton (NCC). In total, 1,215 conodont specimens were obtained from 24 samples through the Wulanhudong and Baiyanhuashan formations at the Baiyanhuashan section. Thirty-six species belonging to 17 genera, including Tasmanognathus coronatus new species, are present. Based on this material, three conodont biozones—the Belodina confluens Biozone, the Yaoxianognathus neimengguensis Biozone, and the Yaoxianognathus yaoxianensis Biozone—have been documented, suggesting that the Baiyanhuashan conodont fauna has a stratigraphic range spanning the early to middle Katian. The Baiyanhuashan conodont fauna includes species both endemic to North China and widespread in tropical zones, allowing a reassessment of the previous correlations of the Katian conodont zonal successions proposed for North China with those established for shallow-water carbonate platforms at low latitudes. UUID: http://zoobank.org/7cedbd4a-4f7a-4be6-912f-a27fd041b586

New occurrences of the Pennsylvanian index ammonoidDunbaritesfrom the North American midcontinent

2009 ◽  
Vol 83 (3) ◽  
pp. 405-413 ◽  
Author(s):  
David M. Work ◽  
Royal H. Mapes
Keyword(s):  
North America ◽  
Type Species ◽  
Additional Species ◽  
North Central ◽  
The North ◽  
South Central ◽  
West Texas ◽  
Kasimovian Stage ◽  
New Occurrences ◽  
Stratigraphic Range

Ten newly recoveredDunbaritesspecimens significantly extend the known stratigraphic range ofDunbarites.These include the first documented Midcontinent Basin records of the Missourian type speciesDunbarites rectilateralis(Miller, 1930) from north-central Oklahoma. Additional species ofDunbaritesfrom south-central Oklahoma and north-central and West Texas are described asDunbarites wewokensisn. sp. andDunbarites boardmanin. sp. AlthoughDunbaritesis an extremely rare component (~0.025 percent) of Middle and Upper Pennsylvanian ammonoid assemblages, Ruzhencev and Bogoslovskaya (1971, 1978) suggested thatDunbaritesandParashumarditesRuzhencev, 1939 be used as genozone markers for the Kasimovian [Zhigulevian] Stage (Missourian in North America). As demonstrated by this report, the range ofDunbaritesis not confined to the Kasimovian, thereby precluding its use as a Kasimovian Stage indicator.

A probable glacio-marine deposit of Late Ordovician—Early Silurian age from the north central Newfoundland Appalachian Belt

1974 ◽  
Vol 111 (6) ◽  
pp. 549-564 ◽  
Author(s):  
A. M. McCann ◽  
M. J. Kennedy
Keyword(s):  
North Atlantic ◽  
Late Ordovician ◽  
Mobile Belt ◽  
North Atlantic Region ◽  
Upper Ordovician ◽  
Atlantic Region ◽  
North Central ◽  
Marine Deposits ◽  
Lower Silurian ◽  
The North

SummaryConglomerate beds occur in an Upper Ordovician—Lower Silurian clastic sequence on the northeastern side of the Newfoundland Central Paleozoic Mobile Belt. They contain scattered pebbles and cobbles dispersed in a finely laminated sandstone and siltstone matrix. Laminations are generally 5–20 mm thick and the clasts 10–300 mm across. The laminations are locally disrupted by the clasts. These laminations have subsequently been tectonically flattened into augen around the clasts and locally disrupted by boudinage. It is concluded that these conglomerate beds represent icerafted glacio-marine deposits interbedded with turbidites which were probably deposited in a locally restricted marine environment. The deposits are interpreted on the basis of scattered fossil localities as being of Late Ordovician–Early Silurian age. They are compared with deposits of similar age elsewhere in the North Atlantic region.

Endobiotic cornulitids in Upper Ordovician tabulate corals and stromatoporoids from Anticosti Island, Quebec

2010 ◽  
Vol 84 (3) ◽  
pp. 518-528 ◽  
Author(s):  
Owen A. Dixon
Keyword(s):  
Coral Species ◽  
Coral Host ◽  
Shell Wall ◽  
Upper Ordovician ◽  
Layered Shell ◽  
Tabulate Coral ◽  
Anticosti Island ◽  
Commensal Relationship ◽  
Stratigraphic Range ◽  
Tabulate Corals

Conoidal shells of Cornulites celatus n. sp. occur commonly within host coralla of Propora conferta Milne-Edwards and Haime, 1851, sensu lato, from the Laframboise Member of the Ellis Bay Formation (Ashgill: Upper Ordovician) at Pointe Laframboise on western Anticosti Island. Examples have also been found at the same locality in the tabulate corals Paleofavosites sp., Acidolites arctatus Dixon, 1986, and A. compactus Dixon, 1986, and the stromatoporoid Ecclimadictyon sp., but not in other associated tabulate coral species. Growth interference between the shells and their hosts indicates a commensal relationship. C.celatus apparently had a more limited paleoenvironmental range than its principal coral host species, which occurs abundantly elsewhere on the island without its endobiotic partner. The diagnosis of Cornulites is emended to include forms having a two-layered shell wall with a distinctive outer layer consistently preserved as prismatic calcite. This new species extends the known stratigraphic range of cornulitids in commensal relationships with corals and stromatoporoids from the Silurian back to the Upper Ordovician.

scholarly journals EXPERIMENTAL STUDIES ON ENCEPHALITIS

1935 ◽  
Vol 62 (6) ◽  
pp. 827-847 ◽  
Author(s):  
Leslie T. Webster ◽  
George L. Fite ◽  
Anna D. Clow ◽  
Hugo Muench
Keyword(s):  
New York ◽  
Experimental Studies ◽  
Type Virus ◽  
Protective Activity ◽  
North Central ◽  
Protective Properties ◽  
The North ◽  
In Vitro Aging

1. A protection test for measuring serological protective properties against the encephalitis (St. Louis type) virus is described. 2. Normal non-contact sera and sera from persons supposed to have had no exposure to the disease do not protect against the virus. 82.5 per cent of sera from tested St. Louis encephalitis convalescents and at least 66 per cent of sera from tested persons thought to have had the disease do show protective properties. 3. The protective activity of sera is maintained for at least 2½ years after onset of the disease. In vitro aging of serum decreases its activity. 4. Protection tests indicate that the virus was present as early as 1932 in Paris, Illinois, spread through the north central states and reached New York in 1933, and was again active in the north central states in 1934.

Uplift of the Tug Hill Plateau in northern New York State

2010 ◽  
Vol 47 (8) ◽  
pp. 1055-1077 ◽  
Author(s):  
J. L. Wallach ◽  
M. Rheault
Keyword(s):  
New York ◽  
Shear Zone ◽  
New York State ◽  
Upper Ordovician ◽  
Northern Limit ◽  
York State ◽  
The North ◽  
Plateau Uplift ◽  
Passive Response ◽  
Tectonic Boundary

The Tug Hill Plateau is a roughly elliptical-shaped area located in northern New York State that rises above the adjacent landscape and is underlain predominantly by Middle to Upper Ordovician strata. Its elevated character is interpreted as a passive response to the tectonic uplift of the adjacent Precambrian basement located to the east and northeast of the plateau. Uplift of the basement is also inferred to have resulted in the strata on the plateau and in the topographically lower terrain to the north dipping gently towards the southwest. Tilting of the plateau was probably facilitated by rotation along the newly recognized regionally extensive Black River fault, which separates the plateau from the uplifted basement and marks the plateau’s east-northeastern limit. The northern limit of the plateau, accentuated by a pronounced escarpment, is aligned with the northeast-trending Carthage–Colton shear zone, a major Precambrian tectonic boundary. Uplift of the Adirondack Highlands and Tug Hill Plateau, relative to their counterparts northwest of the shear zone, is believed to have been enabled by reactivation of the Carthage–Colton shear zone.

scholarly journals Economic Feasibility of Using Solar Energy in the Production of Greenhouse Tomatoes

1982 ◽  
Vol 11 (2) ◽  
pp. 127-132 ◽  
Author(s):  
Pritam S. Dhillon ◽  
Daniel Rossi
Keyword(s):  
New York ◽  
Fossil Fuels ◽  
Economic Feasibility ◽  
Production Costs ◽  
Tomato Production ◽  
North Central ◽  
Greenhouse Tomato ◽  
The North ◽  
Northern Regions ◽  
Greenhouse Tomatoes

The energy crunch of the mid-seventies has adversely affected the greenhouse tomato industry in the North Central and Northeast regions. Traditionally, these two regions had been the main producers of greenhouse tomatoes in the U.S. where, because of the climatic restriction, greenhouse tomato production evolved to supply fresh tomatoes during winter and spring months. Since greenhouse producers in the north rely on fossil fuels for heating purposes, their production costs have escalated, thereby tending to price these tomatoes out of the market. In recent years many greenhouse tomato producers in the northern regions have either ceased production or switched into alternative enterprises. For instance, the Census of Agriculture reported 45 growers in Massachusetts in 1974, with covered areas of 535,842 square feet; by 1979, according to extension experts, the number declined to 25 and the area declined to between 150,000 and 200,000 square feet. The number of growers in New Jersey declined from 42 in the 1974 census to only 19 in 1979. Similar declines have occurred in New York and Pennsylvania.

Mélange development in the Boones Point Complex, north-central Newfoundland

1981 ◽  
Vol 18 (3) ◽  
pp. 433-442 ◽  
Author(s):  
K. Douglas Nelson
Keyword(s):  
Debris Flow ◽  
Late Ordovician ◽  
The South ◽  
Upper Ordovician ◽  
North Central ◽  
Clastic Rocks ◽  
The North ◽  
Volcaniclastic Rocks ◽  
Acadian Orogeny

The Boones Point Complex in north-central Newfoundland is a narrow mélange belt separating Roberts Arm terrain volcanic and volcaniclastic rocks to the north from Upper Ordovician westerly derived clastic rocks to the south and east. The mélange has a sedimentary matrix and contains a polymict assemblage of blocks. Limestone blocks have yielded Llanvirn–Llandeilo conodont faunas. Sedimentologic and structural analyses indicate that the complex is composed of subaqueous debris flow deposits, which are the proximal facies equivalent of the Late Ordovician clastics to the south. This debris flow material was tectonically deformed prior to the Medial Devonian 'Acadian' orogeny, probably as a result of earlier 'Taconic' thrusting.

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