Abundant fossil bones, teeth, trackways, and other hard evidence have revealed that Earth was the domain of the dinosaurs for at least 230 million years. But so far, not a single trace of dinosaur ...

SEM-BSE images of quench crystals and other surface features of meltglass. (A) #1: ... the Libyan Desert glass field and the Australasian tektite field, ... fragments of the Sikhote-Alin iron ...

The 1.07 Myr old Bosumtwi impact structure (Ghana), excavated in 2.1–2.2 Gyr old supracrustal rocks of the Birimian Supergroup, was drilled in 2004. Here, we present single crystal U–Pb zircon ages ...