[1] A kilometers‐thick sedimentary sequence in Gale Crater exhibits stratigraphic changes in lithology that are consistent with transitions in aqueous and climatic conditions purported to be global in scale. The sequence is divided into two formations, where the Lower formation exhibits a net transition in mineralogy from clay/sulfate to sulfate/oxide assemblages and is separated from the overl...

The upper 1200 m of pre-Pliocene sediment recovered by Cape Roberts Project (CRP) drilling off the Victoria Land coast of Antarctica between 1997-1999 has been subdivided into 54 unconformity-bound stratigraphic sequences, spanning the period c. 32 to 17 Ma. The sequences are recognised on the basis of the cyclical vertical stacking of their constituent lithofacies, which are enclosed by erosio...

Crowns of four crinoid species, Talarocrinus planus Weller, 1920, Phacelocrinus longidactylus (McChesney, 1860), Ampelocrinus mundus? Kirk, 1942, and Phanocrinus maniformis (Yandell and Shumard, 1847) are reported from the limestones of the Wymps Gap Member of the Greenbrier Formation in northern West Virginia. Collectively these species indicate an early Chesterian age for the Wymps Gap Member...

We present zircon (U-Th)/He(ZHe) data for 17 Proterozoic basement samples from elevation profiles on the three peaks in Front Range of Colorado that are at elevations over 14,000 ft. (4267 m, locally known as “fourteeners”), with complementary Raman a sample subset. ZHe dates Longs Peak northern uniformly Late Cretaceous to Eocene (37 ± 1 Ma 137 2 Ma), while those Mt. Evans (34 606 18 Ma) and P...

The Hemse Group is one of the least understood stratigraphic units Silurian sequence Gotland, Sweden. New results from airborne transient electromagnetic (ATEM) measurements in combination with previously published data field studies and geophysical investigations shed new light on carbonate platform development during early- to mid-Ludlow Group. ATEM reveals a transgressive phase that began ne...

In this study, a variety of test and analysis methods, such as cast thin sections, fluorescent scanning electron microscopy, fluid inclusions, etc., were comprehensively used combined with logging data, sedimentary systems, burial history other research results, to systematically study the diagenesis characteristics Middle Permian Lower Wuerhe formation–Lower Triassic Baikouquan formation reser...

Hill-hole pairs are subglacial landforms consisting of thrust-block hills and associated source depressions. Formed by evacuation material where ice sheets have been locally frozen to the substrate, they give insights into paleo-ice-sheet dynamics. The aim this study was document relationships between ancient hill-hole identified on a buried glacial unconformity with structure underlying sedime...

We have studied the syn-kinematic very low-grade metamorphism in a polyphase Variscan deformed region using X-ray diffraction techniques. Two phases of regional metamorphism are related to their respective episodes of penetrative deformation in the southern Central Iberian Zone. The data obtained suggest that the rocks did not reach metamorphic equilibrium, but strain favoured the progress of m...