Results 71 to 80 of about 1,497,171 (212)

A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy [PDF]

Acta Palaeontologica Polonica
A new species of bubble-headed trilobite, Staurocephalus oliveae sp. nov., is described from 250 specimens collected from a recently discovered locality in the Sholeshook Limestone Formation (upper Katian, Upper Ordovician; Ashgill, Cautleyan Zone 1 ...
MANUS G. LEIDI, LUCY M.E. MCCOBB, PATRICK D. MCDERMOTT, ALAN W. OWEN   +3 more
doaj   +1 more source

Reconstruction of karst aquifer system beneath lower coal group and source-specific prevention and control technology for karst water disaster in Huainan Coalfield

Meitan kexue jishu
The Huainan Coalfield boasts abundant coal resources, with an annual coal production of 80 million tons in 2022, making it one of China's major coal-producing regions in eastern China.
Zhigang XIE, Feng HAN, Shancheng CHEN, Hai DING, Gui SUN, Guangquan XU   +5 more
doaj   +1 more source

A new species of graptolite from the western margin of the Kufra Basin, Libya [PDF]

, 2013
Normalograptus kufraensis sp. nov. occurs as monospecific assemblages in the Tanezzuft Formation at the western margin of the Kufra Basin (Jabal Eghei), southern Libya.
Elgardy, Mohamed, Meinhold, Guido, Le Heron, D. P., Page, A. A., Le Heron, Daniel Paul, Page, Alex, Le Heron, Daniel P., DANIEL P. LE HERON, MOHAMED ELGADRY, ALEX PAGE, Elgadry, Mohamed, GUIDO MEINHOLD   +11 more
core   +1 more source

Ripple marks as indicators of Late Ordovician sedimentary environments in Northwest Estonia [PDF]

Estonian Journal of Earth Sciences, 2008
Late Ordovician sedimentary environments promoting the development of ripple marks in shallow shelf carbonate deposits of northern Estonia are analysed.
Hints, Linda, Miidel, Avo
doaj  

Genesis of dolomite in the upper assemblage of the Ordovician Majiagou Formation in the southeastern Sulige gas field, Ordos Basin, China: Evidence from C, O, and Sr isotopes and major and trace elements

Energy Exploration & Exploitation, 2020
Typical dolomite reservoirs exist in the upper assemblage of the Ordovician Majiagou Formation in the southeastern Sulige gas field, Ordos Basin, however, the current understanding of dolomite genesis needs to be clarified.
Liwen Zhu, Zhenliang Wang, Qianghan Feng, Bo Zhang, Li Wei, Zhuyu Yu   +5 more
doaj   +1 more source

Lamina Influences on Tensile Strength of Shallow Marine Shales from Upper Ordovician, Western Ordos Basin. [PDF]

ACS Omega, 2023
Wang D, Liu Z.
europepmc   +1 more source

New SHRIMP U-Pb data from the Famatina Complex: constraining Early–Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina

Geologica Acta, 2009
New SHRIMP U-Pb zircon ages are reported for igneous and sedimentary rocks of the Famatina Complex, constraining the age of the magmatism and the ensialic basins.
J.A. DAHLQUIST, R.J. PANKHURST, C.W. RAPELA, C. GALINDO, P. ALASINO, C.M. FANNING, J. SAAVEDRA, E.G. BALDO   +7 more
doaj  

Late Cenozoic Sediment Provenance in the Northern Canterbury Basin, Aotearoa New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
Late Cenozoic strata of the northern Canterbury Basin record uplift and erosion of mountain ranges adjacent to the transition from oblique subduction to strike‐slip on the Australian–Pacific plate boundary. Using the provenance of conglomerate clasts and sandstone samples, we reconstruct sediment transport pathways and, by inference, exhumation and ...
Matthew O. Parker, Kari N. Bassett, Matthew W. Sagar, Alexander R. L. Nichols, Greg H. Browne, Andrew Nicol   +5 more
wiley   +1 more source

First report of an aulaceratid stromatoporoid from the Ordovician of Baltica [PDF]

Estonian Journal of Earth Sciences
The aulaceratid stromatoporoids first appeared in the late Middle Ordovician and had achieved a worldwide distribution in tropical to subtropical shallow-marine environments by the Late Ordovician; however, their presence in Baltica has not been ...
Juwan Jeon, Ursula Toom
doaj   +1 more source

The Fossil Invertebrate Holotype Specimens in the Collection of the University of Otago Department of Geology, Dunedin, New Zealand

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
The 196 invertebrate holotypes held in the University of Otago Department of Geology are catalogued in detail. A short history of the Geology Museum, notable contributors to the invertebrate collection, highlights of the collection and notes on the information provided are followed by a list of the holotypes under eight phyla: Porifera, Cnidaria ...
Jeffrey Hudson Robinson, Daphne Euphemia Lee, Donald Alexander Bankier MacFarlan   +2 more
wiley   +1 more source