Early Lowstand Systems Tract

Late Lowstand Systems Tract

Lowstand Systems Tract

Lowstand wedge

Since this Systems Tract is equated with the relative fall in sea level the Falling Stage Systems Tract (FSST) was first fully defined by Plint and Nummedal, (2000). Coe et al (2002) also believe this Systems Tract should be called the Falling Stage Systems Tract, and throughout most of this web site we honor this terminology. The Systems Tract that follows Falling Stage Systems Tract is now know as the Lowstand Systems Tract. In the earlier terminology of Posamentier and Allen (1999), the Lowstand Systems Tract was divided into Early and Late Phases, and they called Falling Stage Systems Tract, the Early Lowstand Systems Tract.

In the Upper Miocene of Mallorca, Pomar (1991) defined the offlapping reefs in as deposited during falling sea level. Offlap was here used according to original definition of offlap by Swain (1949). The later Pomar & Ward, (1994) defined the Offlapping Systems Tract where it is associated with the same Upper Miocene of Mallorca offlapping reefs.

References
Coe, Angela L.,(Ed) 2002, The Sedimentary Record of Sea Level Change, Cambridge University Press 288 pp.
Plint, A.G., and D. Nummedal, 2000, The falling stage systems tract: recognition and importance in sequence stratigraphic analysis; in , Sedimentary Responses to Forced Regressions; D. Hunt and R. Gawthorpe, eds., Geological Society of London, Special Publications, 172, p. 1-17.
Pomar, L., 1991, Reef geometries, erosion surfaces and high frequency sea level changes, Upper Miocene Reef Complex, Mallorca, Spain: Sedimentology, v. 38, p. 243–269.
Pomar, L. and Ward, W.C., 1994, Response of a Miocene carbonate platform to high-frequency eustasy. Geology, 22:131-134.
Posamentier, H.W., and Allen, G.P., 1999, Siliciclastic sequence stratigraphy—Concepts and applications: SEPM (Society for Sedimentary Geology) Concepts in Sedimentology and Paleontology Series, v. 7, 210 p
Swain, F.M., 1949, Onlap, offlap, overstep, and overlap, AAPG Bull. 33, 634-636.