Torrance, CA Quadrangle 2018 USGS 7.5 Minute Topo Map
To download the Torrance, CA Quadrangle 2018 USGS 7.5 Minute Topo Map, please use the link below.
To download the Torrance, CA Quadrangle 2018 USGS 7.5 Minute Topo Map, please use the link below.
Blue Opal Gemstone The blue opal gemstone, like all other types of opal, is not a mineral. Instead, it is an amorphous mineraloid, which means it is a substance that comprises a specific arrangement of smaller microcrystalline silicas, which result in a blue spectrum of light reflection. Blue opal has an appealing luster and appearance,…
The Historical Salton Sea Fishery The Salton Sea fishery is a historical part of the Salton Sea, California’s largest body of water and arguably, the largest environmental disaster to date. At a time before toxicity levels at the Salton Sea became problematic, many fish species were stocked into the lake for sport and commercial purposes….
Agate Types & Geological Properties of the Agate Crystal The agate crystal is a microcrystalline-quartz mineraloid that has a lustrous display of multi-color banding and results from long-term accumulations of siliceous groundwater deposits in rock cavities. Much like other mineraloids, all agate types form over thousands of years inside the existing voids of other igneous,…
The St. Francis Dam Disaster The St. Francis Dam disaster of 1928 was the failure of a large concrete gravity dam due to unmitigated geologic hazards, causing over 55 miles of violent flooding, and over 400 deaths. It is said to be California’s worst engineering catastrophe to date. Updated April 11, 2024. Saint Francis Dam…
Geologic Description of Mars Perseverance Sol 125 Photo This geologic description of Mars is possible due to public photographs by NASA’s Mars Perseverance rover. This photograph was taken on June 27, 2021 on Earth, or Sol 125 on Mars. The geologic description of Mars by this photograph may be incomplete or pending peer review. And…
Geology of East Hollywood, Los Angeles, California & Hydrogeology This post summarizes the basic geology of the East Hollywood region of Los Angeles California. Some geological and hydrogeological data may be incomplete or pending review. Nonetheless, students, geologists, and earth scientists are welcome to openly use, critique, and contribute information. To do so, please refer…