Remote sensing images and recent field studies provide important morphological and structural constraints for the BP and Oasis impact structures in Libya. The BP structure (25°19' N, 24°20' E) is highly eroded and appears on satellite images in the form of a set of concentric rings. The rocks are composed of sandstones of the Jurassic to Cretaceous Nubia Formation. The Landsat image allows divi...

The Cenomanian–Early Turonian Mishrif Formation is a great contributor to oil production in Iraq. Integrating petrographic, mineralogical, and wireline logging data from 52 wells, this study provides an improved understanding of the sequence stratigraphy, depositional evolution, reservoir characteristics Mesopotamian Basin, south Five types facies associations are classified: lagoon, shoal, rud...

Feathers are under-represented in the fossil record because soft tissues do not usually preserve well sedimentary sequences. Fossil feathers nevertheless extremely important resolving pattern and process related to origin of dinosaur flight. In recent years, a number have been discovered which mummified amber; these preserved three dimensions with remarkable sub-microscopic details especially f...

Abstract The Cretaceous-Paleogene (K-Pg) contact interval is constrained by vertebrate fossil sites at seven in the Tornillo Group and lies within an 80–100-m stratigraphic section between top of Javelina Formation base “log jam sandstone” marker bed Black Peaks Formation. In western exposures this interval, highest occurrence situ dinosaur specimens lowest Paleocene mammal are separated unusua...

Abstract Belts of Cordilleran arc plutons in the eastern part Mojave crustal province, inboard from southwestern North American plate boundary, record major magmatic pulses at ca. 180–160 and 75 Ma smaller 100 20 Ma. This cyclic magmatism likely reflects evolving plate-margin processes. Zircon Lu-Hf isotopic characteristics inherited zircons for different-age may relate magma sources to tectoni...

Gnetales comprise three unusual genera of seed plants, Ephedra, Gnetum, and Welwitschia. Their extraordinary morphological diversity suggests that they are survivors of an ancient, more diverse group. Gnetalean antiquity is also supported by fossil data. Dispersed "ephedroid" (polyplicate) pollen first appeared in the Permian >250 million years ago (Myr), and a few megafossils document the pres...

IN THIS PAPER the discovery in Japan of smaller Foraminifera from the Upper Cretaceous strata is recorded for the firsi: time. This contribution, in addition to its specific biostratigraphic application in Japan, has further interest by reason of its extension of the geo. graphic range ,of the widely distributed Cretaceous pelagic foraminiferan, Globotruncana. In the north Pacific region, Globo...

Upper abyssal to lower bathyal benthic foraminifera from Ocean Drilling Program Sites 689 (present water depth 2080m) and 690 (present water depth 29I4m) on Maud Rise (Antarctica) recorded changes in deep-water characteristics at high southern latitudes during the cenozoic. The benthic foraminiferal faunas show only minor differences as a result of the difference in water depths between the sit...