Associate Professor of Geological Sciences
2008 Ph.D., University of Texas at Austin, Geology
2003 M.S., New Mexico University, Geological Sciences
2000 B.S., Montana State University, Earth Sciences
(1) Depositional Systems and Dynamic Stratigraphy (GEOL 490/690)
The formation, fill and economic resource potential of ancient sedimentary basins is the primary focus of my academic research. To understand the linkages between tectonics, sedimentary process and basin dynamics, I use an integrated approach using a range of datasets. Typically, I use a mixture of outcrop, seismic, well-log and core in my research. The methods I use include detailed sedimentology, regional-scale outcrop-to-subsurface sequence stratigraphy, geologic mapping, provenance analysis, and paleocurrent analysis. Geographically, my research is centered in the Rocky Mountain Region. Because much of my work is mega-regional (hundreds to thousands of kilometers), I'm currently investigating stratigraphic problems in Montana, Wyoming, Colorado, Utah, northern Arizona and eastern California. Stratigraphically, I'm interested in the Mesozoic with considerable past and current research in the Cretaceous, and recent interests developing in the Permo-Triassic.
Core research themes that I am currently pursuing:
1. Understanding basin dynamics and their fill- especially the role of dynamic subsidence,
Recent Synergistic Activities
-undergraduate students presented their core descriptions/interpretations to local industry professionals and the general public in the Anchorage community. Students were evaluated on their technical content, poster presentations and ability to communicate with specialists and non-specialists from the community. Participants ranged from elementary school students to volunteer judges from USGS, ConocoPhillips, BP, AK Division of Oil and Gas, and UAA.
Current and Recent Research Grants
2015 NSF-Collaborative Research Grant Co-PI (in review- $343,000)
(*indicates co-written with student)
*Aschoff, J.L. and Edwards, S.A., 2013, Stratigraphic controls on tight-gas sandstones: Insight from regional sequence-stratigraphic outcrop-to-subsurface correlation of the Upper Williams Fork Formation, Piceance Basin, CO, RPSEA-Department of Energy Report #08122.4
Steel, R.J., Plink-Bjorklund, P. and Aschoff, J.L., 2012, Tidal deposits of the Campanian Western Interior Seaway, Wyoming, Utah and Colorado, in Principles of Tidal Sedimentology, Springer Publishing, 621 p.
*Valora, P.M. and Aschoff, J.L., 2012, Geologic map and sections of the Thistle 7.5 Quadrangle: Insights into tectono-stratigraphic development of the Southern Provo Salient, Utah: UGS Miscellaneous Publication #12-1.
Aschoff, J.L. and Steel, R.J., 2011, Anomalous clastic wedge development during the Sevier-Laramide transition in the Cordilleran Foreland Basin, USA: GSA Bulletin;DOI: 10.1130/B30248.1
Aschoff, J.L., and Steel, R.J., 2011, Anatomy and development of a low-accommodation clastic wedge, Upper Cretaceous, Cordilleran Foreland Baisn, USA: Sedimentary Geology;DOI: 10.1016/j.sedgeo.2010.10.006
Aschoff, J.L., 2011, Year 1 Project Results- Uinta Basin Joint Industry Consortium, Unpublished Report
Aschoff, J.L., 2010, Preliminary regional sequence-stratigraphic framework and characterization of potential fluvial reservoirs of the Upper Mesaverde Group, Uinta Basin, Utah: UGS Open File Report #569.
Aschoff, J.L., 2010, Stratigraphy and Reservoir Characteristics of the Mesaverde Group, Uinta Basin, UT: QEP (formerly Questar) Industry Training Fieldtrip Guidebook
Aschoff, J.L. and Steel, R.J., 2009, Development of an anomalous clastic wedge: A "sink-to-source" transect through Upper Cretacesous Cordilleran Foreland Basin fill, Utah and Colorado, USA: SEPM Fieldtrip #8 Guidebook
Aschoff, J.L. and Schmitt, J.G., 2008, Distinguishing syntectonic unconformity types to enhance analysis of growth strata: An example from the Cretaceous, southeastern Nevada, U.S.A.: Journal of Sedimentary Research, v. 78, p. 608 - 623. DOI: 10.2110/jsr.2008.069
Aschoff, J.L. and Giles, K.A., 2005, Salt diapir-influenced, shallow marine sediment dispersal patterns: insights from outcrop analogs: AAPG Bulletin, v. 89, no. 4, p. 1-23. DOI: 10.1306/1023040416
Lawton, T.F., Shipley, K.W., Aschoff, J.L., Giles, K.A. and Vega, F.J., 2005, Basinward transport of Chicxulub ejecta by tsunami-induced backflow, La Popa basin, northeastern Mexico: implications for distribution of impact-related deposits flanking the Gulf of Mexico: Geology, v. 33, no. 2. DOI: 10.1130/G21057.1
Aschoff, J.L. and Schmitt, J.G., 2004, Geologic map of the 1:24,000 Dell, MT 7.5' quadrangle, Cordilleran Fold and Thrust Belt, Southwestern Montana: Montana Bureau of Mines and Geology Open File Report #520, 30p.
Aschoff, J.L., Olariou, C. and Steel, R.J., (in prep.), Bayhead Deltas: Identification, Significance and External Controls on their Development: Sedimentology
Aschoff, J.L., (in prep.), Improved Model for Supradetachment Formation from Growth-strata Analysis: Hornelen Basin, Norway: Geology
(>40 total;*with student)
*Aschoff, J.L., 2015, New stratigraphic constraints on the spatio-temporal structural evolution in the Uinta, Piceance and Denver Basins: 2015 AAPG Annual Meeing, Denver, CO
Aschoff, J.L., 2014, The importance of stratigraphic architecture in tracking the migration of dynamic subsidence in the Cordilleran Foreland Basin, 2014 GSA Annual Meeting, Vancouver, BC
Aschoff, J.L., 2014, Stratigraphic Evidence for Stepwise Migration of Basins Formed by Mantle Flow During Subduction: Review and New Data: BP-America BPXA Geosicence Lunch, Anchorage, AK
Aschoff, J.L., 2014, Aschoff, J.L., 2013, Re-evaluation of the Hornelen "supradetachment" Basin, Norway: New Insight from Growth-strata Analysis: 2013 AAPG Annual Meeting, Longbeach, CA
*Harvey, K. and Aschoff, J.L. 2013, Analysis and Correlation of Growth Strata of the Lower DawsonFormation: Insight into the Tectono-stratigraphic Evolution of the Colorado Front Range: 2013 AAPG Annual Meeting
*Weichman, M. and Aschoff, J.L., 2013, Application of Sequence Stratigraphy to Nonmarine Successions Revisitied: An Example from the Middle and Upper Williams Fork Formation, Piceance Basin CO
*Daniele, N.P. and Aschoff, J.L., 2012, Preliminary reservoir characterization of fluvial "tight" gas sands of the upper Mesaverde Group, Uinta basin, Utah: 2012 AAPG Annual Meeting, Longbeach, CA
*Weichman, M.L. and Aschoff, J.L., 2012, Preliminary Facies Analysis, Regional Sequence Stratigraphy and Distribution of Stratigraphically- controlled Mechanical Units of the middle and upper Williams Fork Formation , Piceance Basin, CO: 2012 AAPG Annual Meeting, Longbeach, CA