Systems tract

{
  "id": "MLC-T-OAG-003745",
  "term": "Systems tract",
  "field": "Oil and gas",
  "definition": "A set of contemporaneous depositional systems linked by sediment transport that makes up one part of a depositional sequence and forms during one phase of relative sea-level change. The standard tracts are lowstand, transgressive and highstand, with a falling-stage tract added in some schemes. Each is bounded by key surfaces such as the sequence boundary, the transgressive surface and the maximum flooding surface.",
  "subject": "Geology",
  "url": "https://mlchart.com/terminology/oil-and-gas/systems-tract/"
}