Classification of Phosphatic Sedimentary Rocks
(1) Pristine: Phosphates that are in pristine conditions have not undergone bioturbation. In other words the word pristine is used when phosphatic sediment, phosphatized stromatolites and phosphate hardgrounds have not been disturbed.
(2) Condensed: Phosphatic particles, laminae and beds are considered condensed when they have been concentrated. This is helped by the extracting and reworking processes of phosphatic particles or bioturbation.
(3) Allochthonous: Phosphatic particles that were moved by turbulent or gravity-driven flows and deposited by these flows.
Read more about this topic: Phosphorite
Famous quotes containing the word rocks:
“But square-cut or pear-shape, these rocks don’t lose their shape!”
—Leo Robin (1900–1984)