pitchstone

Thick viscous pitchstone lava flowed out, filling a river valley.

Faircloth's first book published by Pitchstone Press, Attack of the Theocrats!

The most recent volcanic eruption at Yellowstone, a lava flow on the Pitchstone Plateau, occurred 70,000 years ago.

One of the urns found contained fragments of processed Arran pitchstone, indicating some economic activity & commerce.

The largest of these flows formed the Pitchstone Plateau in southwestern Yellowstone National Park.

Pitchstone Flow at Bechler Meadows 12.

Flint and stone tools were found, as well as a piece of pitchstone thought to have come from the Isle of Arran.

Charlottesville, Virginia: Pitchstone Publishing.

Lewis Lake and Shoshone Lake are both located a few miles northeast of the Pitchstone Plateau.

Durham, N. C.: Pitchstone Publishing.

The pitchstone ridge of An Sgùrr on the Isle of Eigg, Scotland, was originally formed as a lava flow in a valley.

Founded by Kurt Volkan in 2003, Pitchstone Publishing has published numerous books by leading academics and scholars, particularly in the fields of applied psychiatry and psychoanalysis.

The surrounding basalt was softer than the pitchstone, and hence the valley became inverted, with the pitchstone withstanding the erosion far better than the surrounding rock.

The Pitchstone Plateau, named after the lava pitchstone occupies the southwest corner of the park in the Bechler and Fall River drainages.

It was built on a foundation of massive rhyolite, massive pitchstone, and associated unmassive pitchstone agglomerate geologic formations adjacent to the Owyhee Mountains.

LAUNCH A BOAT Lewis Lake, situated between the 10,000-foot Red Mountains to the east and the wildlife-abundant Pitchstone Plateau to the west, boasts plenty of quiet bays teeming with ospreys and herons.

More rarely lavas are completely fused at the moment of ejection; they may then cool to form a non-porphyritic, finely crystalline rock, or if more rapidly chilled may in large part be non-crystalline or glassy (vitreous rocks such as obsidian, tachylyte, pitchstone).

Archaeological exploration of these villages has uncovered artifacts made of three types of obsidian: True obsidian, which is transparent with closely-spaced, horizontal black bands; pitchstone, actually a dense, opaque, black volcanic glass; brown obsidian, streaked with flowing bands of brown, red, and black.

It includes varieties of andesite, argillite (slate), basalt, bluestone, breccia, conglomerate, coquina, coral, dacite, diabase, diorite, dolomite, gabbro, gneiss, granite, granodiorite, greenstone, labradorite, limestone, marble, melaphyre, pitchstone, pumice, pyrophyllite, quartz, quartzite, sandstone, schist, serpentinite, shellstone, soapstone, syenite, travertine, and tuff.

They are often visible in specimens of obsidian, pitchstone and rhyolite as globules about the size of millet seed or rice grain, with a duller luster than the surrounding glassy base of the rock, and when they are examined with a lens they prove to have a radiate fibrous structure.