[[file:Systems_Tracts.jpg|thumb|400px|left|Systems tracts: Highstand, transgressive, and lowstand. Modified from Vail.<ref name=ch04r99></ref> From Snedden and Sarg.<ref name=Sneddedandsarg_2008>Snedden, John W., and J. F. (Rick) Sarg, Seismic Stratigraphy-A Primer on Methodology, Search and Discovey Article #40270 (2008).</ref>]] | [[file:Systems_Tracts.jpg|thumb|400px|left|Systems tracts: Highstand, transgressive, and lowstand. Modified from Vail.<ref name=ch04r99></ref> From Snedden and Sarg.<ref name=Sneddedandsarg_2008>Snedden, John W., and J. F. (Rick) Sarg, Seismic Stratigraphy-A Primer on Methodology, Search and Discovey Article #40270 (2008).</ref>]] |