conglomerate
conglomerate
Sandstone is likely the sedimentary rock that was part of a beach, river, or stream environment. It forms from the accumulation and compaction of sand-sized particles, which are commonly carried and deposited by water in these environments.
conglomerate
The sedimentary rock most likely to have been deposited in high-energy streams is conglomerate. Conglomerate is composed of larger, rounded clasts that are typically transported and deposited by strong currents, indicating high-energy environments. The presence of these larger particles suggests a dynamic setting where water flow is sufficient to carry and deposit such materials. This rock type is commonly found in riverbeds and areas with significant water movement.
A stream's sediment load is typically deposited, eroded, and redeposited many times in a stream channel, especially during climatic variations such as flooding. Sediments are deposited throughout the length of the stream as bars or floodplain deposits. At the mouth of the stream, the sediments are usually deposited in alluvial fans or deltas, which represent a lower-energy, more "permanent" depositional environment that is less susceptible to changes in the stream flow. i got this from clift notes
Decrease in stream velocity
Decrease in stream velocity
The sedimentary rock from the stream mouth will contain more marine fossils (i.e. any at all) and will be composed of finer grains (as they are eroded during passage in the stream and as the stream gets closer to the sea or a lake it will tend to become wider and have a lower flow velocity meaning it has less energy to transport sediment meaning that the larger particles will have been deposited further up the stream nearer it's head). The rock from the stream head will have coarser grains and a lack of any marine fossils. Other indicators may be used depending on the specific rock type.
A decrease in water velocity usually causes more sediments to be deposited at a location in a stream. This can happen when the stream widens, the channel gradient decreases, or obstacles such as rocks or vegetation slow down the flow of water.
Sedimentation.
Levees and regoliths.
lake