Geological Surveys Database

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1916, Arizona Geological Survey
Lead is a soft, bluish white metal; its freshly cut surface has a bright metallic lustre, which, upon exposure, becomes coated with a film of the oxide. Unlike other metals, it is sufficiently soft to be scratched with the thumb nail. It is fashioned into foil or wire by rolling and pressing. It is...
1916, Arizona Geological Survey
Because of the fact that the greatest zinc smelting centres of the world outside of the United States are located in the war zone of Europe, the effect of the war on the spelter market has been most pronounced. The European smelters have either been forced to suspend operations or, if able to...
1916, Arizona Geological Survey
The gypsum industry is a growing one, and will apparently continue to grow for some time. Producers report better trade conditions for 1913 than for 1912. In ten years the production has jumped from 1,000,000 tons of crude gypsum in 1903 to more than 2,500,000 tons in 1913. Gypsum was produced in...
1916, Arizona Geological Survey
The only production of magnesite in the United States is from California where a very few mines had a total output of
1918, Arizona Geological Survey
1920, Arizona Geological Survey
1925, Arizona Geological Survey
1919, Arizona Geological Survey
2013, Arizona Geological Survey
Strong international demand and high potash prices have prompted a number of companies to conduct or plan potash exploration in the already productive Paradox Basin of southeastern Utah. In response to potash interest in the area, the Utah School and Institutional Trust Lands Administration...
2013, Arizona Geological Survey
2013, Arizona Geological Survey
The St. Peter Sandstone is typically a well-sorted, friable, ultra-pure, fine- to medium-grained, quartzose sandstone with silica content higher than 99 weight percent in places. The sand grains are well-rounded, highly spherical and characteristically frosted. Their size typically varies from 2...
2013, Arizona Geological Survey
Intensive lateritic weathering of bedrock under tropical or sub-tropical climatic conditions can form a variety of secondary, supergene-type deposits. These secondary deposits may range in composition from aluminous bauxites to iron and niobium, and include rare earth elements (REE). Over 250...
2013, Arizona Geological Survey
Pinite is a compact, fine-grained, usually amorphous mica as defined by the AGI glossary. It is also a term that has been used to identify metamorphic rock that is the result of the retrograde decomposition of cordierite-altered volcanic rocks, resulting in an impure micaceous rock that may contain...
1916, Arizona Geological Survey
The fame of Arizona as a copper producing state is so great and widespread that sometimes her deposits of other minerals do not receive their due share of attention. It is not very generally known that within the boundaries of Arizona are some of the largest and richest gold placers in the country...
1965, Arizona Geological Survey

About the Geological Surveys Database

As of July 2018, the Geological Surveys Database replaces the Critical Issues Research Database, providing an improved portal for decision makers and others to locate and comprehensively search state geological survey publications and U.S. Geological Survey factsheets.

The Geological Surveys Database is now an external database that has be integrated into AGI's Critical Issues webpages. To use the entire suite of features of the Geological Surveys Database, please visit

The Geological Surveys Database provides full-text searching of publications meaning that users can not only search metadata fields (i.e., title, author, notes, etc.), but also search against the entire text of the publications in the database in order to find the information they are seeking. The database also features interactive geographic searching of publications that have geographic coordinates, browsing of publications, faceted searching, and more.

Record display views include robust metadata that is based on a combination of GeoRef metadata that is supplemented with additional metadata from the state geological surveys and U.S. Geological Survey, links to state geological survey websites, suggestions for similar items, and a map display of associated geographic metadata coordinates.

The Geological Surveys Database also provides a wide array of user features including the ability to export citations, create user accounts to save queries, citations and create curated lists, add comments and custom tags to records in the database, and more.

The Geological Surveys Database is a collaborative effort between the American Geosciences Institute and U.S. state geological surveys to help increase the discoverability and use of geological survey publications by decision makers as they address issues at the intersection of the geosciences and society.