Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 38 for “"Open marine"”.
-
The Sequence Stratigraphic Context of Mixed Basin Margin Evaporites in the Harrisburg Member of the Permian Kaibab Formation, Northern Arizona and Southern Utah
… of the Fossil Mountain Member deposited in open-marine conditions and the overlying Harrisburg Member deposited in restricted conditions. The Harrisburg Member includes facies and depositional environments ranging from open-marine shallow-subtidal wackestone - packstone, restricted subtidal …
-
Optimisation of DNA extraction from teeth submerged in sea water in False Bay, South Africa
… useable DNA from human remains recovered from an open marine environment is problematic, and in some cases, impossible. The reason is unclear given the lack of research on marine decomposition, DNA survival in seawater, and possible methods to optimise the DNA extraction workflow. Compounding this …
-
Paleoenvironmental interpretation of the Guilmette Formation near Ely, Nevada
… lagoon environment that prograded into an open marine shallow shelf. 4) Upper mound member--deposited during fluctuating sealevel that caused alternations between lagoon and open marine conditions. The upper most part represents a trend toward shallow open shelf contitions. 5) Inter-mound …
-
Origin of Visean (Mississippian) Frobisher Group Coated Grainstone Shoals in the Williston Basin: Deposition and Diagenesis
… in grainy carbonate rocks, long interpreted as marine oolites. This sedimentological and diagenetic study of core from the Frobisher in the Bryant and Pinto areas of southeastern Saskatchewan concludes that the ubiquitous coated grains in these rocks are in fact predominantly pedogenically …
-
Integrated High-resolution Stratigraphy of the Doushantuo Formation, South China
… (1) was the Doushantuo Formation deposited in an open marine or a (partially) restricted basin; (2) are Doushantuo paleoenvironmental and biostratigraphic proxies consistent with an Ediacaran oxidation event; and (3) can the Doushantuo acanthomorphic acritarchs be useful biostratigraphic tools for …
-
High resolution sequence stratigraphy of late Mississippian carbonates in the Appalachian Basin
… muds, ooid shoals, and skeletal banks, and open marine skeletal wackestone and basinal marion the ramp-slope and basin margin. Sequence boundaries are at the top of prograding red-beds, eolianites, and shoal water facies on the ramp, and beneath lowstand sand bodies and quartzose …
-
Stratigraphy, Sedimentology and Early Diagenesis of Pennsylvanian-Permian Mixed Carbonate-Siliciclastic Cyclothems, SW Ellesmere Island, Nunavut
… indicative of environments ranging from open marine, reef, back-reef, shoal, lagoonal carbonates to nearshore sandstones. The studied succession is part of two long-term transgressive and regressive sequences bounded above and below by regional unconformities. These sequences are dated as …
-
Ostracodes of the Piney Point formation (middle eocene) of Virginia
… Point is typical of one inhabiting warm, clear, open marine waters with a slow sedimentation rate and little reworking.
-
Sedimentology, ichnology, and stratigraphic architecture of the upper Devonian-lower Mississippian Bakken Formation, west-central Saskatchewan
… west-central Saskatchewan occurred under either open-marine or marginal-marine conditions. Facies association 1 (open-marine interval), which is made up of F1 through F4, is characterized by the distal Cruziana Ichnofacies. It was deposited within a wave-dominated shallow-marine depositional …
-
Depositional cycles and coral distribution, Mission Canyon and Charles Formations, Madison Group (Mississippian), Williston Basin, North Dakota
… II, Intertidal; III, Restricted Marine; N, Transitional; and V, Open-Marine) and six subenvironments. Each cycle begins with rocks representing an open-marine environment (V), followed by rocks representing progressively shallower environments (IV, III, and II) and culminating in …
-
Stromatolitic Knobs in Storrs Lake, San Salvador, Bahamas: Insights into Organomineralization
… lake, as well as other modern closed-system and open-marine stromatolites, a mechanism for organomineralization and laminae formation can begin to be determined. The mechanism for <em>in situ</em> precipitation is relatively comparible in each of these systems, though the mechanism of laminae …
-
Depositional environments and diagenesis of the Ratcliffe interval, Madison group (Mississippian), Williston Basin, North Dakota
… <p>The initial deposition consisted mainly of marine limestones. The environment gradually became more restricted and deposition of large amounts of anhydrite and dolomite occurred around the basin margin. Sabkha tidal flat areas were present. Highly saline conditions at the end of the …
-
The Occurrence of the Greta Sandstone, Frio Formation (Late Oligocene), Texas Gulf Coastal Plain
… barrier sandstone package grading up to mud-rich open marine inner shelf deposits. The interval is easily recognizable in well logs based on its strong SP and Gamma-ray responses. The depositional limits of the Greta sandstone within the Greta/Carancahua barrier/strandplain system has been mapped …
-
Sequence Stratigraphy and Paleoecology of the Late Mississippian Little Stone Gap Member in the Appalachians of West Virginia
… in continental, low-energy lagoonal and marginal marine environments. Carbonate facies record variable energy conditions in lagoonal, shoal, shoal flank and open marine settings. Parasequence stacking patterns are interpreted as resulting from regional fifth-order glacioeustatic sea-level changes …
-
Early neoproterozoic marine redox conditions recorded in black shale from the little Dal Group, Northwest Territories, Canada
… of oxygenated conditions in the Ediacaran open ocean. This study documents a predominantly open-marine basin that was characterised by ferruginous conditions, similar to Archean and early Paleoproterozoic conditions, with brief intervals when oxic conditions developed.
-
Depositional History and Petroleum Potential of the Middle Devonian Fort Vermilion Formation, Alberta
… primarily on scale and proximity to the marine environment are discussed; these are: i) salina; ii) restricted lagoon; and iii) lake. The evidence garnered through this study are most consistent with deposition in a hypersaline lagoon setting, cut off from the open marine environment. …
-
Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
… events and fluctuations between restricted marine and open marine paleoenvironments were inferred in the W-17001"--Abstract, page v.</p>
-
Community gradients in the Martinsburg formation (Ordovician), southwestern Virginia
… spectrum of environments, from nearshore to open-marine, elastic to carbonate-dominated facies, provide both temporal and geographic variation against which to evaluate changes in species distributions. Five classical, Petersen-type communities were recognized in the Martinsburg using cluster …
-
Carbonate ramp to deeper shale-shelf transitions of an Upper Cambrian (Dresbachian) shelf embayment, Nolichucky Formation, southwest Virginia
… facies are green, calcareous shale with open marine biota; storm and tidal-current deposited parallel to hummocky laminated, calcareous siltstone; flat pebble conglomerate and rare paraconglomerate (10-60 cm thick) with clasts of deeper water lithologies (storm-lag, debris-flow, or other …
-
Micropalaeontology, Palaeoenvironments and Sequence Stratigraphy of the Sulaiy Formation of Eastern Saudi Arabia
… are intertidal, restricted lagoon (subtidal), open marine, deeper open marine, inner shoal, shoal and platform margin. Generating, and testing, a depositional model as a part of formulating a sequence stratigraphical interpretation of a region is a key to understanding its geological …
Page 1 of 2