Where is Weathered Sedimentary Rock found?
Sedimentary rock (unspecified type, likely sandstone or conglomerate)
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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
Global
Weathered sedimentary rocks are ubiquitous globally, occurring wherever sedimentary rocks are exposed to the Earth's surface and subjected to weathering processes. They are particularly prevalent in humid tropical and subtropical regions where chemical weathering is intense, and in temperate regions where both physical and chemical weathering are active.
Outcrops and Road Cuts
Easily observed in natural rock outcrops, cliffs, and artificial exposures like road cuts, where the transition from fresh bedrock to weathered material can often be seen.
River Banks and Coastal Areas
Common along river banks, lake shores, and coastal cliffs where erosion and exposure to water and air are continuous.
Collecting tips
- Look for Discoloration. Weathered rocks often exhibit distinct color changes (reds, yellows, browns) compared to their unweathered counterparts due to the oxidation of iron-bearing minerals.
- Check for Friability. Test the rock's hardness and cohesion. Weathered rocks tend to be softer, more crumbly, and easier to break apart than fresh rock.
- Observe Surface Features. Look for signs of erosion, pitting, rounding, or a 'rotted' appearance on the rock surface. Lichens and mosses often grow more readily on weathered surfaces.
- Examine Grain Integrity. In clastic sedimentary rocks, weathered grains may appear dull, corroded, or easily detached from the matrix.
Quick Check
- Color:
- Variable (reddish, yellowish, brownish, grayish, mottled)
- Luster:
- Dull, earthy, powdery
- Streak:
- Variable, often light-colored (white, pale yellow, pale brown) or matching the rock's weathered color if iron oxides are present.
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