Unformatted text preview: Chemical sediments: precipated from solution; evaporates & salt deposits Organic (biological) sediments • Diagensis is the process by which rocks are formed from sediments at low temperatures and pressures. It comprises a variety of processes as below: -Sediments pile atop other sediments Compaction of sediments under overburden pressure Sediments squeezed more tightly, pore space decreases and pore water squeezed out Cementation of sediments lead to formation of cohesive mass of rocks • Structures & features of sedimentary rocks: bedding, lamination (thin bedding) and stratum • Sedimentary environments (refer to notes)...
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- Spring '11
- Sedimentary rocks, 2mm, 0.002mm, 0.006mm, Diagensis