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Questions and Answers
What are bioclastic phosphorites composed largely of?
What are bioclastic phosphorites composed largely of?
- Peloids and coids
- Pebbles and limestone fragments
- Vertebrate skeletal fragments (correct)
- Phosphatic grains and pellets
What is the internal structure of nodular phosphates?
What is the internal structure of nodular phosphates?
- Composed of phosphatic nodules
- Spherical to irregular-shaped nodules
- Mechanically concentrated by reworking of earlier-formed phosphate deposits
- Homogeneous (structureless) to layered or concentrically banded (correct)
What forms guano deposits?
What forms guano deposits?
- Carbonaceous mudrocks, cherts, and carbonate rocks
- Excrement of birds and possibly bats that has been leached to form an insoluble residue of calcium phosphate (correct)
- Phosphatized fossils and skeletal fragments
- Peloids, coids, pisoids
What composes pebble-bed phosphorites?
What composes pebble-bed phosphorites?
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