sentences:  NHMUK PV R1089, a mandible and a braincase with part of the supratemporal arches collected from the early Tithonian ("Pectinatites wheatleyensis" Sub-Boreal ammonite Zone) Upper Kimmeridge Clay Formation, of Kimmeridge is also referred to "Plesiosuchus".It was also presented by Mansel-Pleydell in 1866, and as with the holotype, was initially considered to belong to a pliosaurid plesiosaur.It was originally described by Owen (1869) as a referred specimen to the species "Pliosaurus trochanterius".