The external-detector method of fission-track (FT) dat­ ing is capable of providing FT ages for individual mineral grains. As a result, tliis method when applied to dating detrital zircons in unreset sandstone samples has much potential for resolving the depositional age and provenance of the samples. One problem is that individual FT grain ages for detrital zircons usually have fairly low prec...

Sandstone intrusions have always caught the attention of geologists and are in many cases highly spectacular due to the contrast between light-coloured intrusive sandstones and dark host mudstones. In recent years it has become increasingly clear, that large, irregular bodies of massive sandstone may also be of intrusive origin, but the timing and nature of remobilization of the primary deposit...

We analyze statistical scaling of structural attributes of two millimeter scale rock samples, Estaillades limestone and Bentheimer sandstone. The two samples have different connected porosities and pore structures. The pore-space geometry of each sample is reconstructed via X-ray micro-tomography at micrometer resolution. Directional distributions of porosity and specific surface area (SSA), wh...

Early regeneration success of upland oaks (Quercus spp. L.) was compared for three regeneration cutting treatments in the Sandstone Mountain Region of northern Alabama. Two 4-acre replications each of block dearcutting. strip cutting, and deferment cutting were established on north-facing slopes. The three harvesting treatments were applied in midsummer. Regeneration subplots were reinventoried...

Deposits of the Warchha Sandstone in the Salt Range, Pakistan are characterised by a range of fluvial facies and architectural elements that together preserve a record of both the proximal and distal parts of a meandering river system that drained the northern margin of Gondwanaland. Several fining-upward cycles are recognised and completely preserved cycles can be divided in to three parts; a ...

Rhagovelia kararao sp. nov., collected in sandstone caves from northern Brazil, is described and compared with similar and related species. Rhagovelia pachymeri Nieser & Melo, 1997 is synonymized with Rhagovelia robusta Gould, 1931. An updated key to the species of the robusta group occurring in Brazil is presented.

This small elapid snake is endangered because of its restriction to a specific habitat (weathered sandstone outcrops in southeastern Australia) that is under heavy pressure for commercial exploitation, especially for "bushrock" in suburban gardens. We review the conservation status of this species, suggest strategies to maintain viable populations, and report consistent success in breeding this...

Brand and Tang (1991) proposed that certain unusual vertebrate trackways "point to subaqueous deposition for at least part of the Coconino Sandstone." They supported their conclusions by demonstrating that western newts produce similar trackway configurations in aquarium experiments. While it is encouraging to see vertebrate ichnology play such a prominent role in fundamental questions concerni...

Introduction: Here we examine nucleation of self-organized spherical precipitates in porous and permeable media. Spheroidal concretions are common in geological environments and can arise through various geological or biological mechanisms, such as growth around an already existing nucleus (e.g. organic matter). Iron oxide concretions, however, often lack any obvious nucleus [1] and their prese...