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Sequence architecture within a low-accommodation setting: An example from the Permian of the Galilee and Bowen basins, Queensland, Australia

¹ Department of Geosciences, 214 Bessey Hall, University of Nebraska–Lincoln, Lincoln, Nebraska 68588-0340; jallen19@bigred.unl.edu
² Department of Geosciences, 214 Bessey Hall, University of Nebraska–Lincoln, Lincoln, Nebraska 68588-0340; cfielding2@unl.edu

Jonathan P. Allen received a B.A. degree in geology-biology from Colby College in 2003 and an M.S. degree in geosciences from the University of Nebraska–Lincoln (UNL). This study stemmed from research he conducted for his M.S. degree. He is currently pursuing a Ph.D. at UNL, studying the evolution of paleoclimate within the Carboniferous of Atlantic Canada.

Chris Fielding holds the Mr. & Mrs. J. B. Coffman Chair in Sedimentary Geology at the UNL. He received his Ph.D. from the University of Durham (United Kingdom) in 1982 and previously worked for BP Exploration and the University of Queensland in Brisbane, Australia. His research interests lie in the stratigraphy of continental, coastal, and shallow-marine successions.

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
The sequence-stratigraphic analysis of nonmarine strata has seen several advances in recent years. Such successions, however, are nonetheless difficult to interpret and correlate because the concepts, principles, and methodologies of sequence stratigraphy were developed for coastal and nearshore marine strata where key stratigraphic surfaces that are clearly related to relative changes in base level can be readily recognized (Posamentier and Vail, 1988; van Wagoner et al., 1990; Posamentier and Allen, 1999). Within nonmarine successions, such key surfaces are commonly cryptic, ambiguous, or not easy to correlate. However, several recent publications have attempted to address the sequence stratigraphy of nonmarine successions and their relationship to time-equivalent marine strata (Shanley and McCabe, 1991, 1993, 1994; Shanley et al., 1992; Wright and Marriott, 1993; Gibling and Bird, 1994; Aitken and Flint, 1995; Olsen et al., 1995; Van Wagoner, 1995; Holbrook, 1996; Yoshida et al., 1996; Burns et al., 1997; Rogers, 1998; Legarreta and Uliana, 1998; Posamentier and Allen, 1999; Lang et al., 2001; and see review of Plint et al., 2001).

Few, if any, of these studies, however, pertain to basin-margin settings. In such low-accommodation environments, it is largely presumed that fluvial styles will remain constant through a cycle of base-level change (e.g., Shanley and McCabe, 1994; Miall, 1996) to form amalgamated, stacked, braided fluvial successions. In general, nonmarine successions formed under conditions of low accommodation are relatively thin, deposited over a long period, and contain multiple unconformities (Wadsworth et al., 1998, 2002; Boyd et al., 2000; Zaitlin et al., 2002; Leckie et al., 2004). Questions concerning the internal architecture of these low-accommodation sequences still remain unresolved. Are there circumstances in which key . . . [Full Text of this Article]