Nichollsia borealis Druckenmiller & Russell, 2008 Nichollssaura is an extinct genus of leptocleidid[1] plesiosaur from the Early Cretaceous Boreal Sea of North America.

The type species is N. borealis, found in the early Albian age Clearwater Formation near Fort McMurray, Alberta, Canada.

[4] Nichollssaura was a small plesiosaur, estimated up to 2.6–2.9 m (8.5–9.5 ft) in length and 135 kg (298 lb) in body mass based on a complete specimen (TMP 1994.122.1).

The type specimen was discovered in one of Syncrude Canada Ltd.'s open-pit oilsand mines near Fort McMurray, Alberta, in 1994, in the Wabiskaw member of the Clearwater Formation.

[7][6] Gastroliths were found in the holotype after they were accidentally exposed when attempting to remove some of the rock surrounding the bottom side of the fossil block with a saw cut.