Vectis Formation

Vectis Formation
Stratigraphic range:
Lower Aptian ~125 Ma
TypeGeological formation
Unit ofWealden Group
  • Shepherds Chine Member
  • Barnes High Sandstone Member
  • Cowleaze Chine Member
UnderliesAtherfield Clay Formation
OverliesWessex Formation
ThicknessMaximum of 66 m
PrimarySiltstone, Mudstone
OtherSandstone, Limestone, Ironstone
Country UK
ExtentDorset, Isle of Wight

The Vectis Formation is a geological formation on the Isle of Wight and Swanage, England whose strata were formed in the lowermost Aptian, approximately 125 million years ago.[1][2] The environment of deposition was that of a freshwater coastal lagoon with occasional marine influence after the early Aptian marine transgression, transitioning from the floodplain environment of the underlying Wessex Formation. The primary lithology is of laminated grey mudstones. The Vectis Formation is composed of three geological members: the Shepherds Chine member, the Barnes High Sandstone member, and the Cowleaze Chine member. It is overlain by the fully marine Atherfield Clay Formation, part of the Lower Greensand Group. Dinosaur remains are among the fossils that have been recovered from the formation.[3]


Other Languages