Fold

{
  "id": "MLC-T-OAG-001527",
  "term": "Fold",
  "field": "Oil and gas",
  "definition": "A wavelike bend or undulation in originally horizontal rock layers, caused by compressional tectonic forces. Folds are classified by their shape, with upward-arching anticlines and downward-arching synclines being the most basic types. Large-scale anticlines form structural traps where oil and gas accumulate at the crest, making them a primary exploration target in many petroleum basins.",
  "subject": "Geology",
  "url": "https://mlchart.com/terminology/oil-and-gas/fold/"
}