GeoMiner Free earth-science tools

Built by a geologist

Delta identification and geology

A landform created by the deposition of sediment at the mouth of a river where it enters a standing body of water such as a lake, sea, or ocean. As flow velocity decreases, the river loses its capacity to transport sediment, resulting in accumulation. Deltas are classified by their dominant shaping process: river-dominated bird-foot, e.g., Mississippi , wave-dominated arcuate, e.g., Nile , or tide-dominated e.g., Ganges-Brahmaputra . Field: sedimentology. Example: The Mississippi River Delta extends into the Gulf of Mexico as a bird-foot delta with multiple active distributary channels, depositing approximately 200 million tonnes of sediment annually.. Related terms: Alluvial, Prodelta, Distributary, Topset.

  • Browse all geology and mining glossary terms — Compare this entry with the complete GeoMiner glossary collection.
  • Previous: Dacite — An intermediate to felsic volcanic rock with a silica content of approximately 63–69% by weight, typically light gray with a porphyritic texture…
  • Next: Denudation — The overall lowering of a land surface through the combined processes of weathering, mass wasting, and erosion.
  • Alluvial

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner
GeoMiner
Last updated
2026-03-30T15:19:41.999576+00:00
Review status
Published; not independently peer-reviewed
  • USGS Thesaurus — U.S. Geological Survey. Controlled earth-science terminology used to describe USGS information resources.
  • Glossary of Geologic Terms — U.S. National Park Service. Geologic definitions prepared by the NPS Geologic Resources Inventory.

Read GeoMiner's editorial methodology or report a content issue.

Common questions

What does Delta mean in geology?
A landform created by the deposition of sediment at the mouth of a river where it enters a standing body of water such as a lake, sea, or ocean. As flow velocity decreases, the river loses its capacity to transport sediment, resulting in accumulation. Deltas are classified by their dominant shaping process: river-dominated bird-foot, e.g., Mississippi , wave-dominated arcuate, e.g., Nile , or tide-dominated e.g., Ganges-Brahmaputra .
What is an example of Delta?
The Mississippi River Delta extends into the Gulf of Mexico as a bird-foot delta with multiple active distributary channels, depositing approximately 200 million tonnes of sediment annually.
Which earth-science field uses the term Delta?
Delta is used in sedimentology.
Which terms are related to Delta?
Related terms in this reference are Alluvial, Prodelta, Distributary, Topset.

JavaScript is loading the interactive GeoMiner experience. The identification tools provide educational candidates, not laboratory confirmation.