Introduction: The Wetumpka Structure is an ~7-8 km diameter impact in Alabama of Late Cretaceous (80-83 Ma) age. The structure was originally reported by [1-2]; subsequent work including drilling has been discussed by [3-10]. An earlier gravity survey [11] indicated that the structure exhibited an annular gravity high gravity over the crystalline rock ridge and low gravity within the interior a...

The Toarcian Posidonia Shale and Hettangian/Sinemurian Formation are the two main Mesozoic source rocks of Upper Rhine Graben (URG). Their thermal maturities measured used to reconstruct history URG. However, maturity these was impacted by: 1) pre-rift burial which includes a 120 My hiatus from Jurassic Paleocene; 2) syn- post-rift histories; 3) current high geothermal gradients associated hydr...

The paper presents original and published data of radioisotope dating volcanic rocks the Magellan Seamounts. These available geological materials allow us to distinguish five major complexes different ages in guyots Seamounts: 1 — Late Jurassic-Early Cretaceous (earliest Cretaceous); 2 Early (Apt-Albian); 3 (Late Cenomanian-Turonian- Campanian); 4 Campanian-Maastrichian); 5 Cenozoic. Each these...

introduction the area studied is located north of azna (lorestan province) in a small portion of the sanandaj – sirjan structural zone (mohajjel et al., 2003).this area is part of the zagros orogenic belt, formed by the opening and closure of neotethyan ocean. from ne to sw, it consists of three parallel tectonic regions: the orumieh-dokhtar magmatic belt, the sanandaj-sirjan structural zone an...

We present a systematic study of thyasirid bivalves from Cretaceous to Oligocene seep carbonates worldwide. Eleven species of thyasirid bivalves are identified belonging to three genera: Conchocele, Maorithyas, and Thyasira. Two species are new: Maorithyas humptulipsensis sp. nov. from middle Eocene seep carbonates in the Humptulips Formation, Washington State, USA, and Conchocele kiritachiensi...

Tourmaline-bearing quartz veins and replacement deposits, commonly copperand gold-bearing, are found in unusual concentration in northwestern Nevada and adjacent northeastern California in Triassic and Jurassic arc rocks and in the Cretaceous plutons that intrude them. Mines and prospects that exploit the tourmaline-bearing deposits are found in a zone approximately 70 miles long and 50 miles w...