Accurate and precise ages of large silicic eruptions are critical to calibrating the geologic timescale and gauging the tempo of changes in climate, biologic evolution, and magmatic processes throughout Earth history. The conventional approach to dating these eruptive products using the 40Ar/39Ar method is to fuse dozens of individual feldspar crystals. However, dispersion of fusion dates is co...

An analytical expression is derived for the thermal response observed during spontaneous imbibition of water into a dry core zeolitic tuff. Sample tortuosity, conductivity, and source strength are estimated from fitting an solution to temperature observations single laboratory test. The closed-form using Green's functions heat conduction in limit “slow” movement; that is, when advection energy ...

During field surveys between 2005 and 2011 in the Tugen Hills by Franco-Kenyan Kenya Palaeontology Expedition, several hominid specimens were discovered Pliocene Mabaget Formation. One mandible fragment, three isolated teeth a pedal phalanx collected from Pelion Member (base of formation aged 5.0–4.5 Ma) are compatible dimensions with Orrorin tugenensis Ardipithecus ramidus whilst Sinibo Member...

The Tomba dei Demoni Alati is located in the Etruscan necropolis of Sovana (Grosseto, Southern Tuscany, Italy). At end 1990s, excavation revealed remains this aedicule tomb, carved into red tuff; 2004, further highlighted new important figurative elements. Etruscans used different methods to decorate rock surfaces which were particularly difficult paint. For reason, porous and irregular surface...

Our collection of meteorites recovered here on Earth contain over 200 samples believed to have originated Mars. It is commonly accepted that these rocks were launched as ejecta during the formation impact craters. The majority are young and basaltic representing only a small fraction martian surface. Previous studies examined impacts into basalt or other competent material, but material bias re...