Conway Formation
Stratigraphic range: Campanian-Maastrichtian
Type	Geological formation
Unit of	Eyre Group
Underlies	Loburn Mudstone
Overlies	Broken River Formation
Lithology
Primary	Sandstone, siltstone
Location
Coordinates	42°36′S 173°30′E / 42.6°S 173.5°E / -42.6; 173.5
Approximate paleocoordinates	57°42′S 149°06′W / 57.7°S 149.1°W / -57.7; -149.1
Region	Canterbury
Country	New Zealand
Extent	South Island
Conway Formation (New Zealand)

The Conway Formation is a Campanian to Danian geologic formation in the South Island of New Zealand and therefore crosses the Cretaceous–Paleogene boundary. Plesiosaur remains are among the fossils that have been recovered from its strata. The Conway Formation is part of the Eyre Group and Haerenga Supergroup.

Fossil content

Among others, the following fossils have been found in the formation:^[1]

• Alexandronectes zealandiensis
• Onchopristis dunklei
• Taniwhasaurus oweni