Friday, May 07, 2004

Sedimentary Rock, Origin of ironstones

The origin of ironstones also is not well understood, but most appear to be derived from the erosion and redeposition of lateritic (iron-rich, red) soils. Ironstones occur as thin (a few tens of metres at most) units interbedded with shallow marine and transitional carbonates, mudrocks, and sandstones. They generally have an o´┐Żlitic texture. Cross-bedding, ripple marks,

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