In the genetic stratigraphic sequence model used in sequence stratigraphy, a bounding surface formed either from allochthonous deposits eroded from the platform margin and slope, or from autochthonous wedges deposited on the upper slope. See systems tract. Compare highstand systems tract; transgressive systems tract. See also regressive systems tract.
Lowstand systems tract
- Third Reich (1933–45)
- third space theory
- Third Way
- Third World
- third world
- Thirsk, Robert Brent (1953– )
- Thirteen Colonies
- Thirty Meter Telescope
- Thirty Years War (1618–48)
- Thirty‐Nine Articles
- thistle
- Thistlewood, Arthur
- thixotropic fluids
- thixotropic mud
- thixotropy
- tholeiite
- tholi
- tholins
- tholoid
- tholus
- Thomas, Andrew Sydney Withiel (1951– )
- Thomas, Donald Alan (1955– )
- Thomas, Edward Donnall
- Thomasius, Christian (1655–1728)
- Thomas precession