The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth.Obsidian is hard and brittle; it therefore fractures with very sharp edges, which were used in the past in cutting and piercing tools, and it has been used experimentally as surgical scalpel blades.alkaline - Term pertaining to a highly basic, as opposed to acidic, substance.

quartz hydration dating-64quartz hydration dating-18

Douglass, Richard Ciolek-Torrello, Sarah Van Galder, Benjamin R. The Coleville and Bodie Hills NRCS Soil Inventory, Walker and Bridgeport, California: A Reevaluation of the Bodie Hills Obsidian Source (CA-MNO-4527) and Its Spatial and Chronological Use. Spatial and Temporal Distributions of Archaeological Heated-Rock Cooking Structures in the Transverse Mountain Ranges: Proposed Markers of Land-Use Shifts since the Early Holocene [SCA Proceedings - PDF].

Grenda, Jeffrey Homburg, Manuel Palacios-Fest, Steven Shelley, Angela Keller and Davis Maxwell Spatial and Temporal Distributions of Archaeological Heated-Rock Cooking Structures in the Transverse Mountain Ranges: Proposed Markers of Land-Use Shifts since the Early Holocene [SCA Proceedings - PDF].

(Hydraulicity is actually defined as the ability to set under water, without any carbon dioxide.) The current debate is focused on the blending of non-hydraulic lime putty and hydraulic hydrate.

It is the author’s view that gauging with hydraulic hydrate is poor practice.

The properties of the lime produced were largely influenced by the chemical composition of the limestone burnt, and limestones containing clay minerals produced a lime with weak hydraulic properties.

The hydraulicity of these limes was likely to be weak because of the low firing temperatures, and weakened further if the lime produced was stored as putty.

abyssal plain - The ocean floor offshore from the continental margin, usually very flat with a slight slope.

accrete - To add terranes (small land masses or pieces of crust) to another, usually larger, land mass. age - A unit of geological time shorter than an epoch, usually lasting several million years.

[Journal of Anthropological Archaeology -61.]Sampling Issues in Evaluations of Diet and Diversity: Lessons from Diablo Canyon. [In Maritime Adaptation and Seaside Settlement along the Pacific Coast of North America during the Pleistocene-Holocene Transition, edited by Jim Cassidy, Robert Ackerman, and Irina Ponkratova, pp. [Journal of California and Great Basin Anthropology -31.]Report on the Vertebrate Fauna from CA-STA-207, Central Diablo Range, Stanislaus County, California: Evidence for an Upland Adaptation with Long-Term Stability in the Central Diablo Range (SCA Proceedings - PDF].