... us about the nature of the source rocks Loose Sediments gravel sand silt clay Sedimentary rocks conglomerate sandstone siltstone shale Detrital Sedimentary Rocks ❖ Other important textural features: ... Detrital Sedimentary Rocks Breccia ❖ Course like a conglomerate, but with angular grains ❖ Short transport! ❖Deposited close to the source area for sediment ◆ Detrital sedimentary rocks Sandstone ... Example: Well-sorted Poorly-sorted ◆ Detrital Sedimentary Rocks Shale & Siltstone ❖ Silt & clay-sized particles (mud, clay, silt) ❖ Over 1/2 of all sedimentary rocks ❖ Particles too small to identify...