![]() ![]() Tsunami – Sedimentary unit deposited by a tsunami.Volcanic – Rupture in the crust of a planet that allows lava, ash, and gases to escape from below the surface Pages displaying short descriptions of redirect targets.Outwash – ripple marks, cross-beds, similar to stream channel.Till – angular to rounded grains, poorly sorted, unstratified (massive).Glacial – Interval of time within an ice age that is marked by colder temperatures and glacier advances Pages displaying short descriptions of redirect targets.Evaporite – Water-soluble mineral deposit formed by evaporation from an aqueous solution.Reef – A shoal of rock, coral or other sufficiently coherent material, lying beneath the surface of water caused by waves and tidal currents.Common sediments are clay, carbonate mud, silica mud. Deep water marine environment – Flat area on the deep ocean floor (abyssal plains) caused by ocean currents.Lower shoreface – Part of the seafloor undisturbed by waves.Upper shoreface – Portion of the seafloor that is shallow enough to be agitated by everyday wave action.Common sediments are carbonates (in tropical climates) or sand, silt, and clay (elsewhere) Shallow water marine environment – processes due to waves and tidal currents, creates shelves and slopes, lagoons.Lake – Large body of relatively still water.Creates beaches, spits, and sandbars with the common sediments of gravel and sand. Beach – Area of loose particles at the edge of the sea or other body of water.Common sediments are carbonates (in tropical climates). Little transportation, creates lagoon bottom environment. Lagoonal – Shallow body of water separated from a larger one by a narrow landform.Tide – Rise and fall of the sea level under astronomical gravitational influences – processes due to tidal currents, creates tidal flats (fine-grained, ripple marks, cross-beds).Deltaic – Silt deposition landform at the mouth of a river (possible cross beds, ripple marks) Common sediments are sand, silt, and clay.Common sediments are sand, silt, and clay. Lacustrine – sediment deposited by a lake Pages displaying wikidata descriptions as a fallback – processes due to moving water, mainly lakes.Common sediments are gravel, sand, and silt. ![]() Fluvial – Processes associated with rivers and streams Pages displaying short descriptions of redirect targets – processes due to moving water, mainly streams.Often in deserts and coastal regions and well sorted, large scale cross-beds Aeolian – Processes due to wind activity.Caused by moving water in a fan shape (Alluvial Fan) and containing mostly impermeable and nonporous sediments well sorted. Alluvial – Loose soil or sediment that is eroded and redeposited in a non-marine setting Pages displaying short descriptions of redirect targets – type of Fluvial deposit.Types of depositional environments Diagram to show the different depositional environments in which tsunami deposits are formed – partly after Shanmugam 2006 Depositional environmental model of the Araripe Basin formations, NE Brazil However, the further back in geological time sediments were deposited, the more likely that direct modern analogues are not available (e.g. In most cases, the environments associated with particular rock types or associations of rock types can be matched to existing analogues. In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record. Processes associated with the deposition of a particular type of sediment A diagram of various depositional environments ![]()
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