Results 41 to 50 of about 68,053 (269)

The position of graptolites within Lower Palaeozoic planktic ecosystems. [PDF]

, 1993
An integrated approach has been used to assess the palaeoecology of graptolites both as a discrete group and also as a part of the biota present within Ordovician and Silurian planktic realms.
Allison P.A., Baker A. de C., Bates D.E.B., Beckly A.J., Bergstrom J., Berry W.B.N., Berry W.B.N., Berry W.B.N., Bjerreskov M., Brenchley, Briggs D.E.G., Bulman O.M.B., Bulman O.M.B., Bulman O.M.D., Cloud P., Colbath G.K., Conway Morris S., Conway Morris S., Conway Morris S., Conway Morris S., Conway Morris S., Cooper R.A., Crowther P.R., Crowther P.R., Elles G.L., Erdtmann B.D., Erdtmann B.D., Erdtmann B.D., Finney S.C., Fortey R.A., Fortey R.A., Fortey R.A., Fortey R.A., Gurich G., Herr S.H., Jackson D.E., Jager H., Jager H., Kemp A.E.S., Kirk N. H., Kirk N.H., Kirk N.H., Kirk N.H., Koren T.N., Kozlowski R., Kozlowski R., Koztowski R., Koztowski R., Koztowski R., Leggett J.K., Lenz A.C., Loydell D.K., Mauchline J., Nicholson H.A., Palmer D., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rickards R.B., Rigby S., Rigby S., Rigby S., Rosen B.R., Ruedemann R., Semina H.J., Sheehan P.M., Siveter D.J., Stormer L., Towe K.M., Tsudy D.M., Urbanek A., Urbanek A., Urbanek A., Walters M., Wells M.J., Whittington H.B., Williams S.H., Williams S.H., Williams S.H., Williams S.H., Williams S.H., Winston J.E., Zalasiewicz J.A., Ziegler A.M.   +85 more
core   +1 more source

Detrital-zircon geochronology and provenance of the Ocloyic synorogenic clastic wedge, and Ordovician accretion of the Argentine Precordillera terrane [PDF]

, 2015
The Precordillera terrane in northwestern Argentina is interpreted to be anexotic (Laurentian) continental fragment that was accreted to western Gondwanaduring the Ordovician. One prominent manifestation of the subductionand collision process is a Middle?
Astini, Ricardo Alfredo, McClelland, William C., Mueller, Paul A., Thomas, William A.   +3 more
core   +1 more source

Silurian graptolite biostratigraphy of the Röstånga-1 drill core, Scania:a standard for southern Scandinavia [PDF]

, 2014
The Rostanga-1 core from west-central Scania provides the most complete succession of the Sandbian (Upper Ordovician) through lower Telychian (Silurian, Llandovery) strata of southern Scandinavia. The Hirnantian is identified in the Kallholn Formation by
Ahlberg, Per, Loydell, David Kendrick, Maletz, Jörg, Suyarkova, Anna   +3 more
core   +2 more sources

Population structure of graptolite assemblages [PDF]

, 1998
Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at ...
Brenchley, Bulman, Bulman, Cate, Deevey, Finney, Hutt, Kaesler, Kemp, Kidwell, Kirk, Kirk, Kurtén, Lenz, Loydell, Palmer, Pearson, Rigby, Rigby, Rigby, Rigby, Snyder, Thorsteinsson, Underwood, Underwood, Urbanek, Urbanek, Williams   +27 more
core   +1 more source

Evaporites and the salinity of the ocean during the Phanerozoic: Implications for climate, ocean circulation and life [PDF]

, 2005
A compilation of data on volumes and masses of evaporite deposits is used as the basis for reconstruction of the salinity of the ocean in the past.
Balukhovsky, A. N., Flögel, Sascha, Hay, William W., Migdisov, A., Söding, Emanuel, Wold, C. N.   +5 more
core   +1 more source

Integration of Darriwilian (Middle Ordovician) δ13Corg chemostratigraphy with graptolite biostratigraphy in the classical Röstånga area in northwestern Scania (southern Sweden) [PDF]

Estonian Journal of Earth Sciences, 2020
The largely covered Middle Ordovician succession in the classic geological Röstånga area in northwestern Scania has not been studied for some 80 years.
Stig M. Bergström, Per Ahlberg, Jörg Maletz, Frans Lundberg, Michael M. Joachimski   +4 more
doaj   +1 more source

Climate change and the selective signature of the Late Ordovician mass extinction [PDF]

, 2012
Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record ...
Finnegan, Seth, Fischer, Woodward W., Heim, Noel A., Peters, Shanan E.   +3 more
core   +3 more sources

Tectonic history of the South Tannuol Fault Zone (Tuva region of the northern Central Asian Orogenic Belt, Russia) : constraints from multi-method geochronology [PDF]

, 2020
In this study, we present zircon U/Pb, plagioclase and K-feldspar Ar-40/Ar-39 and apatite fission track (AFT) data along the South Tannuol Fault Zone (STFZ).
De Grave, Johan, Mikhailova, Polina, Nachtergaele, Simon, Van Ranst, Gerben, Vetrov, Evgeny, Vetrova, Natalia, Zhimulev, Fedor   +6 more
core   +1 more source

Shale lithofacies types and reservoir characteristics from Ordovician Wufeng Formation to the first sub-member of the first member of Silurian Longmaxi Formation, northeast Zhaotong area

Shiyou shiyan dizhi, 2023
Shale lithofacies has an important influence on shale reservoirs. It controls the hydrocarbon generation capacity, storage performance and fracturing performance of shale to a certain extent.
Guanbao REN, Lei CHEN, Yubing JI, Qingsong CHENG   +3 more
doaj   +1 more source

Ordovician conodonts of the Katkoyeh formation in the Kuh-e-Bonorg section, Kalmard Horst (west of Tabas) [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2020
In this research, Ordovician conodonts obtained from the sedimentary succession of the informal Katkoyeh formation is studied in a stratigraphic section at the south of Kuh-e-Bonorg, eastern flank of Kalmard Anticline in the west of Tabas (Central Iran).
Mohammad Nezhadabbas, Abbas Ghaderi, Hadi Jahangir, Ali Reza Ashouri   +3 more
doaj   +1 more source