Chemical analyses returned by Mars Pathfinder indicate that some rocks may be high in silica, implying differentiated parent materials. Rounded pebbles and cobbles and a possible conglomerate suggest fluvial processes that imply liquid water in equilibrium with the atmosphere and thus a warmer and wetter past. The moment of inertia indicates a central metallic core of 1300 to 2000 kilometers in...

Impact ejecta from the Albion Formation are exposed in northern Belize. The ejecta come from the outer portion of the continuous ejecta blanket of the Chicxulub crater, which is located 360 km to the northwest. The basal unit of the Albion Formation is a 3⁄41-m-thick clay and dolomite spheroid bed composed of up to four discrete flows. The clay spheroids are altered impact glass, and the dolomi...

Depending on their grain sizes (settling velocities), sed iments are t ransported in rivers as bed load, in suspens ion , or as wash load. The coarsest material rolls or bounces along the bot tom as bed load whereas finer material is placed into suspens ion by the water turbulence. The finest sed iments are t ranspor ted as wash load. evenly distr ibuted through the water depth and effectively ...

Emplacement of submarine landslides, or mass-transport deposits, can radically reshape the physiography continental margins, and strongly influence subsequent sedimentary processes dispersal patterns. Typically, progressive healing complicated relief generated by landslide occurs prior to progradation systems. However, subsurface seabed examples show that channels incise directly into landslide...

The East Chia Sabz site is located on the bank of the Seymareh River in the middle of the Zagros Mountain chain. The site is among the few examples of the acramic Neolithic sites of the 8th millennium B.C. of Zagros which was archaeologically investigated during the rescue archaeological studies of the Seymareh dam. Numerous bullet-shaped cores were unearthed during the archaeological excavatio...

The main aim of the present study was to scrutinize substrate and microhabitat preferred by Himalayapotamon emphysetum under laboratory conditions. In first experiment, different substrates: gravel, stones, cobbles were placed in round plastic containers, second experiment: grass, aquatic plants, wood fragments used as microhabitats for analyzing preference crab species. Minimum mortality obser...

Published evidence of Oldowan stone exploitation generally supports the conclusion that patterns of raw material use were determined by local availability. This is contradicted by the results of systematic studies of raw material availability and use among the earliest known archaeological sites from Gona, Afar, Ethiopia. Artifact assemblages from six Pliocene archaeological sites were compared...

Hurricane Irma (September 2017) was one of the most devastating hurricanes in recent times. In January 2018, a post-hurricane field survey conducted on Anegada (British Virgin Islands) to report erosional and depositional evidence caused by Irma's storm surge waves. We document type extent hurricane-induced geomorphological changes, allowing for an improved risk assessment hurricane-related inu...

OPPORTUNITY. B. L. Jolliff, W. H. Farrand, J. R. Johnson, C. Schröder, C. M. Weitz, and the Athena Science Team. Department of Earth and Planetary Sciences and the McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130 ([email protected]), Space Science Institute, 4750 Walnut St. #205, Boulder, CO 80301, U.S. Geological Survey, 2255 N. Gemini Dr., Flagstaff, AZ 86001, I...