Category: Geology

  • Browse the USGS Publications Warehouse
    • The Publications Warehouse collection is broken into several broad types. Nearly all publications are in the Article or Report types.
  • Carbonate Rocks and Associated Landforms
    • In the Mojave National Preserve, carbonate sedimentary rocks of Proterozoic and Paleozoic age crop out throughout the Clark Mountains, the Mescal Mountains, in the northern Ivanpah Range, in the central portion of Providence Mountains, and elsewhere. This page has examples of common fossiliferous carbonate rocks of Paleozoic age.
  • Collecting Rocks
    • Learn how to identify types of rocks, tips on starting a collection, and more.
  • Faults and Active Tectonics
    • Evidence of faulting can be seen throughout the Mojave region. Faults range in scale and complexity from small, simple offset measurable in inches or feet to massive thrust faults, normal faults, and strike-slip faults that have displacements ranging upward to tens of miles or more.
  • Fossils, Rocks, and Time
    • Learn about rock layers and fossil succession.
  • General Geologic History
    • The oldest rocks exposed in the Mojave National Preserve are between 1.7 and 2.5 billion years old (early Proterozoic age). They consist of metamorphic rocks derived from pre-existing sedimentary, volcanic, and igneous intrusive rocks.
  • Geomagnetism Frequently Asked Questions
    • All about the earth's magnetic field, magnetic elements, and compasses.
  • Granitic Rocks and Associated Landforms
    • Weathering and erosion in arid regions underlain by granitic bedrock produce unique characteristic landforms.
  • Lead
    • Learn where lead comes from, how we use it, and how we ensure adequate supplies of lead for the future.
  • Magnetic Monitoring of Earth and Space
    • With data provided by magnetic observatories, geophysicists can gain insights into our planetís interior and nearby space environment without even leaving the ground.
  • Minerals and Materials in the 20th Century: A Review
    • The period from 1900 to 2000 was marked by significant changes in the various industries that consume metals and industrial minerals and by major historic events that affected the way minerals are produced and used. This chapter is an overview of some of those changes.
  • Minerals Use in Safety Applications in the Workplace
    • List of selected minerals and common safety applications in which they are important.
  • National Geomagnetism Program
    • Learn about magnetic fields, USGS research programs, and geomagnetism operations.
  • Natural Gemstones
    • Learn about birthstones, mining gemstones, chemical formulas of gemstones, and more.
  • Pediments and Alluvial Fans
    • The term mountain front is an imaginary borderline between a mountainous area and a low, gently dipping plain. A pediment is a gently sloping erosion surface or plain of low relief formed by running water in arid or semiarid region at the base of a receding mountain front.
  • Stream Channel Development in the Changing Mojave Climate
    • Progressive landscape development in any particular area is a function of many factors including climate (precipitation and seasonal weather patterns), vegetation, slope and drainage topography, bedrock character, tectonic history, and possibly other factors.
  • The Great Ice Age
    • The great ice age, a recent chapter in Earth's history, was a period of recurring widespread glaciations.
  • Volcanic Rocks and Associated Landforms
    • This page features examples of landform features associated with modern and ancient volcanism.