Where is Glauconitic Sandstone found?
Glauconitic Sandstone
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Open the appGlauconitic Sandstone occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Glauconitic Sandstone
United States
Extensive deposits in the Atlantic Coastal Plain (e.g., New Jersey, Maryland, Virginia), particularly in Cretaceous and Paleogene formations (e.g., Hornerstown Formation, Navesink Formation). Also found in parts of the Gulf Coastal Plain.
Europe
Widespread in Cretaceous and Paleogene marine sequences, including the Paris Basin (France), the Weald Basin (UK), and parts of Germany and Russia.
North Africa and Middle East
Occurs in various marine sedimentary basins, often associated with phosphate deposits.
Australia
Found in Mesozoic and Cenozoic marine successions.
Collecting tips
- Look for Green Coloration. The most distinctive feature is the green to olive-green color. If a sandstone has this hue, it's a strong indicator of glauconite.
- Examine Grain Shape. Under a hand lens, look for small, rounded, ovoid, or pelletal green grains, which are characteristic of glauconite.
- Check Geological Maps. Consult geological maps of coastal plain regions or areas known for marine sedimentary rocks of Cretaceous or Paleogene age. Formations specifically named 'Greensand' are obvious targets.
- Consider Depositional Environment. Glauconitic sandstones form in specific shallow marine settings. Look for outcrops in areas that were once ancient continental shelves.
Quick Check
- Color:
- Green, olive-green, bluish-green
- Luster:
- Dull to earthy (rock), dull to sub-vitreous (glauconite grains)
- Streak:
- Pale green to greenish-white (for glauconite, not typically tested for the whole rock)
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