Where is Weathered Sedimentary Rock found?
Sedimentary Rock (likely sandstone or siltstone with iron staining)
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Open the appWeathered Sedimentary Rock 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 Weathered Sedimentary Rock
Colorado Plateau, USA
Extensive exposures of iron-stained sandstones (e.g., Navajo Sandstone, Entrada Sandstone) forming iconic red rock landscapes.
Australian Outback
Widespread occurrences of weathered sedimentary rocks, often forming duricrusts and lateritic profiles with intense iron staining.
Deserts globally
Arid environments promote physical weathering and the formation of desert varnish (iron and manganese oxides) on rock surfaces, intensifying iron staining.
Any region with exposed sedimentary strata
Common in road cuts, river valleys, coastal cliffs, and mountain ranges where sedimentary rocks are uplifted and subjected to weathering.
Collecting tips
- Look for color. The most obvious indicator is the characteristic reddish, yellowish, or brownish coloration, often unevenly distributed or forming distinct bands/rinds.
- Check friability. Test the rock's coherence. Weathered samples will often be crumbly, easily broken, or leave a dusty residue on hands.
- Observe surface features. Look for pitting, solution holes, exfoliation, or a 'rotted' appearance compared to fresh rock surfaces.
- Consider the environment. Weathered rocks are found at the Earth's surface, particularly in areas of active erosion or long-term exposure.
Quick Check
- Color:
- Reddish-brown, yellowish-brown, orange, ochre
- Luster:
- Dull, earthy
- Streak:
- Yellowish-brown to reddish-brown (due to iron oxides/hydroxides)
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