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The Upper Jurassic Brushy Basin Member of the Morrison Formation is widely accepted as having accumulated in a semi-arid meandering stream/floodplain ecosystem. However, in central Utah, the lower Brushy Basin Member is interpreted to be an enclosed inland fresh water lake with a river delta forming its easterly margin. The Aaron Scott Quarry fauna includes numerous dinosaurs as well as typical semi-aquatic taxa such as turtles and crocodiles and provides a unique opportunity to study the taphonomy of a fluvio-deltaic lacustrine setting in the Jurassic. We interpret that during a period of drought numerous animals congregated on the delta as other localized watering holes dried up. Over time, their carcasses accumulated, were broken up, abraded and reworked by a variety of biological and physical agents before final burial. Preferential alignment of the fossil bones suggests two flow directions: the distributary channel flowing off the delta and a wave-induced current at 90 degrees to the channel. The bones are distributed in a layer about 1 m thick. The bones at the base are highly fragmented and abraded while those higher in the bed belong to a single individual of a diplodocid sauropod. Numerous Allosaurus teeth are associated with the diplodocid bones and may have been shed during repeated scavenging by several Allosaurus. Janet Bertog, Department of Physics and Geology, Northern Kentucky University, Highland Heights, Kentucky 41099, USA. bertogj@nku.edu David L. Jeffery, Department of Petroleum Engineering and Geology, Marietta College, Marietta, Ohio 45750, USA. jefferyd@marietta.edu Katherine Coode, Department of Physics and Geology, Northern Kentucky University, Highland Heights, Kentucky 41099, USA. katherin_coode@usgs.gov William B. Hester, Department of Physics and Geology, Northern Kentucky University, Highland Heights, Kentucky 41099, USA. archromeo@yahoo.com Rath R. Robinson, Department of Physics and Geology, Northern Kentucky University, Highland Heights, Kentucky 41099, USA. RathR@aol.com John Bishop, Department of Petroleum Engineering and Geology, Marietta College, Marietta, Ohio 45750, USA. jbishop187@aol.com PE Article Number: 17.3.36A Copyright: Society for Vertebrate Paleontology October 2014 Submission: 10 January 2014. Acceptance: 31 August 2014 Bertog, Janet, Jeffery, David L., Coode, Katherine, Hester, William B., Robinson, Rath R., and Bishop, John. 2014. Taphonomic patterns of a dinosaur accumulation in a lacustrine delta system in the Jurassic Morrison Formation, San Rafael Swell, Utah, USA. Palaeontologia Electronica Vol. 17, Issue 3;36A; 19p; palaeo-electronica.org/content/2014/811-taphonomy-of-the-morrison-fm BERTOG ET AL.: TAPHONOMY OF THE MORRISON FM.