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Mountain INTRODUCTION This study examines a thick (>1,600 m) section of the Lower Cretaceous Fortress Mountain Formation exposed at Atigun syncline in the foothills of the northern Brooks Range (fi gs. 1 and 2). To date, this interval has proven diffi cult to interpret (see introductory comments in Crowder, 1989); similar to other conglomerate-rich successions, limited faunal evidence and generally non-unique depositional processes hamper attempts at environmental reconstruction (e.g. Nemec and others, 1984). This ambiguity is refl ected in widely varying earlier interpretations ranging from deep marine fan, to slope, to fan-delta, and even fl uvial depositional settings (Crowder, 1987; 1989; Goff, 1990; Ryherd, 1990; Schenk and Bird, 1992). The purpose of this paper is to document the lithofacies and provide a composite, detailed measured section of the coarser, upper part of the formation exposed on the west face of Atigun syncline (Sheet B-1; fi g. 2). This brief contribution will be followed by a more exhaustive manuscript that provides detailed lithofacies descriptions and interpretations, as well as discussion of provenance, reservoir quality, stratal stacking patterns, and fan delta classifi cation (Wartes and Carroll, in prep.).

Measured section and facies analysis of the Lower Cretaceous Fortress Mountain Formation, Atigun syncline, northern Alaska