Geology for Fossil Hunters – Exploratorium – Evidence
The colors in this key identify different rock types of different ages—younger rocks on top. Geologists use names like Precambrian and Mesozoic to describe the age of a rock formation—words that send most people to the dictionary.
USGS Mineral Resources Program – USGS Western Mineral and Environmental Resources Science Center
This cover formed prior to, during, and after deposit formation and consists of rocks, soils, and water WMR scientists are working to specify and evaluate innovative methods of combining geologic, geochemical, geophysical, and mineral resources data with existing and new mineral deposit models to predict the possibilit…
Explore Nature – The Grand Age of Rocks – The Numeric Ages for Rocks Exposed within Grand Canyon – …
Dating volcanic ash beds and lava flows interlayered with the sedimentary rocks, and intrusive igneous rocks such as dikes and sills that cross cut the sedimentary rocks allow this numeric calibration.
DOE – Educational Initiatives – NETL
Capillary A fissure or a crack in a formation which provides a route for flow of water or hydrocarbons. Therefore the drainage system efficiency is crucial for the correct management of a landfill. The students will gain an appreciation for the work done by scientists and engineers to restore the environment.
The Geological Society of America – GSA Today – Evidence for early life on Earth and the search for life on other …
For example, an ancient sedimentary deposit inextricably linked to biological activity is the banded iron formation (BIF).
Lunar and Planetary Institute (LPI) – LPI Seminar Series
Formation of the youngest basalts may have been triggered by formation of the Imbrium basin, but the existence of older KREEP basalt magmas (if verified) suggests a role for earlier large impacts as well. Observation of a lava flow interbedded with sedimentary rock in the Sinus Meridiani region.
American Museum of Natural History – A Study of the Geology of the Rocks of the Huntington Formation in the Izee and …
The terraine mostly consists of volcanic (flow) and volcaniclastic (pyroclastic and epiclastic) rocks, although only volcanic (flow) rock specimens were collected on my expedition.
Alaska Division of Geological & Geophysical Surveys – Alaska Division of Geological & Geophysical Surveys – USGS Miscellaneous Field Studies Map Series – Publications
1972, Reconnaissance geologic map and geochemical analysis of stream-sediment and rock samples of the Anchorage A-6 Quadrangle, Alaska, 2 sheets, scale 1:63,360.
A Web Browser Flow Chart for the Classification of Igneous Rocks – Classification of Igneous Rocks …
In the published hierarchical system, lamprophyres, lamproites and kimberlites were combined under "lamprophyric rocks", but if this portmanteau term is to be abandoned, then it must be replaced by a logical hierarchy of classification for these three groups of rocks that integrates them with the melilitic and leucitic…
Sedimentary structures – Wikipedia
Typical unidirectional bedforms represent a specific flow velocity, assuming typical sediments (sands and silts) and water depths, and a chart such as below can be used for interpreting depositional environments, with increasing water velocity going down the chart.