ALASKA DIVISION OF GEOLOGICAL REPORT OF INVESTIGATIONS 2010-2 & GEOPHYSICAL SURVEYS Shellenbaum and others (2010) Sheet 1 of 1

Location Map Top Mesozoic Unconformity Depth Surface Construction

154°00´ 153°00´ 152°00´ 151°00´ 150°00´ 149°00´ 28W 27W 154°00´ 25W 24W 23W 22W 21W 153°00´ 20W 19W 18W 17W 16W 152°00´ 14W 13W 12W 11W 10W 151°00´ 9W 8W 7W 6W 5W 150°00´ 3W 2W 1W 1E 2E 149°00´ 3E 4E Introduction 20N 19N Fault This map shows the depth (in feet below sea level) to the top Mesozoic An implicit assumption in this depth conversion methodology is that the 0 19N unconformity, an important stratigraphic horizon in the Cook Inlet basin, structural dip varies smoothly between control points. However, wells 61°30´ 7 Alaska. Since 1957, more than 1.3 billion barrels of oil and more than are mostly drilled on major structural highs in Cook Inlet, resulting in Mountain 61°30´ Eklutna 18N 7.7 trillion cubic feet of gas (Alaska Division of Oil and Gas, 2010) have additional velocity control points being needed in areas of inadequate Red outline encompasses 3,547 km (2,204 mi) Peters Creek Fault of CI88 and CI89 prefix seismic data used in been produced from the Cook Inlet basin, nearly all of it from Tertiary sampling, predominantly in the deeper parts of the basin. The additional Castle Eagle River this mapping. ? strata that overlie the top Mesozoic unconformity. The source rock for control point values were estimated from cross plots of time versus 18N Enlarged view of structure on west side of northern Cook Inlet the oil is located in the Mesozoic, and multiple wells have encountered pseudo-velocity, extrapolating an interpreted time-velocity slope to the 4 Fault Anchorage 14W 13W 12W 11W 17N oil shows while drilling through Mesozoic stratigraphy. deeper times observed on the seismic. The velocities from well penetra- tions and added control were then gridded to form a horizon velocity 23 5 The map was constructed primarily from marine seismic reflection data surface, which was multiplied with the seismic one-way time surface to 17N 76 61°30´ 61°00´ -5000 create a depth surface. The depth surface contours were hand edited to 64 10N 6 and oil and gas wells that penetrated the top Mesozoic unconformity. 61°00´ Ranges 16N 10N -10000 Where the well control is too dense to differentiate at the 1:500,000 remove computer-generated artifacts, which were especially apparent on Mountain the edges of seismic control and near faults and other areas of strong 61°30´ scale, an inset map is provided. The map was prepared as part of a multi- Fault ? Eklutna Fault year, multi-faceted effort by the Alaska Department of Natural Resources structural variability. 81 16N to provide the public with the most accurate information possible on the 33 60 73 15N geologic framework of this economically important area. Interpretation Outside Seismic Control Clark 69 Peters Creek Border River 68 62 63 80 Well Interpretation The following data were used to interpret the top Mesozoic unconformity Kenai Lake Fault 60°30´ 15N 74 82 depth surface where seismic was not available: Eagle -15000 60°30´ 9N Castle Eagle River Soldotna Skilak 2 All public wells were obtained from the Alaska Oil and Gas Conserva- -10000 0 14N Bay 9N Kalgin Island Lake • Well penetrations. See table 1. 24 77 ? tion Commission (AOGCC). The wells that penetrated the Mesozoic 79 3 • Bounding faults and fold axes. In places, the western edge of the Fault 78 unconformity are listed in table 1, Depth to top Mesozoic unconformity Bruin 70 86 -10000 basin is bounded by faults (Bruin Bay, Lake Clark, and Castle 14N -10000 -5000 in oil and gas wells. The depth to the top Mesozoic unconformity record- Tustumena Lake 72 Mountain) as mapped by Magoon and others (1976), locally modi- Bay 58 ed in the table was interpreted using borehole geophysical log character, Seward 65 Traces of Lake Clark and Castle Mountain faults are 13N Cook Inlet lithologic logs, and palynology data (Zippi, 2006). Where available, fied where seismic data are available (see Location Map). The Bor- 57 -20000 simplified from Magoon and others (1976). 47 -15000 Fault der Ranges and Eagle River faults (Wilson and others, 2009) are 32 75 Anchorage sonic and density logs were edited and combined to create synthetic 60°00´ displayed along the eastern edge of the basin, but their traces do not 13N Bruin seismograms (denoted by an asterisk in table 1) used in calibrating to the 60°00´ 66 -25000 everywhere coincide with the zero depth contour of the top Meso- 8N 50 seismic data. 12N Fault 8N 61 zoic unconformity surface. This is particularly apparent in the 1 Kachemak Bay area, where well and outcrop data indicate a signifi- ? Seismic Interpretation 15 cant thickness of Cenozoic basin fill overlying the concealed trace (See Location Map for area of two-dimensional seismic coverage) 12N of the Border Ranges fault. In addition, it was noted that the surface ? 90 46 ? 11N fold axes from Magoon and others (1976) matched reasonably well Homer -15000 83 7N 91 The seismic dataset used for interpretation consists of 3,547 km (2,204 0 with the subsurface top Mesozoic unconformity fold axes as 7N 51 Ranges 59°30´ 61°00´ mi) of proprietary, speculative two-dimensional marine data (CI88 and 92 mapped from seismic data, so the surface fold axes (shown on 59°30´ 11N 15W 14W 13W 12W 49 CI89 prefix lines, owned and marketed by CGGVeritas). Together, these

-10000 Location Map) were used to influence contours outside of areas 52 Seldovia 0 5 10 15 Mi. 48 89 surveys include 97 lines with typical spacing of 2.5–8 km (1.5–5 mi), controlled by seismic. Seldovia 10N (Approximate Location) Gulf of Alaska 61°00´ -5000 representing a high-quality regional dataset, used by the Alaska Depart- Arch Inlet Contacts between Mesozoic and Tertiary geologic units. From sur- Augustine Island 23 • Ranges ment of Natural Resources with permission from CGGVeritas. 76 face geologic mapping (Magoon and others, 1976; Wilson and 0 5 10 15 20 25 30 35 40 45 50 Mi 64 10N 59 17 others, 2009). 0 10 20 30 40 50 60 70 80 90 100 Km To tie the seismic data to the well data, calibrations were attempted for Border 81 • Structural contour maps from AOGCC annual reports. The vast 33 9N 60 73 25 all synthetic seismograms of wells on or near seismic lines. Well ties to 154°00´ 153°00´ 152°00´ 151°00´ 150°00´ 69 majority of Cook Inlet oil and gas fields are found in structural traps 68 62 63 80 seismic were analyzed both visually and statistically. Data quality chal- 30 within the Tertiary section. Where seismic data are available, we 74 0 Fault 82 lenges included incomplete or missing logs, hole problems, coals (which 9N -20000 noted that the top Mesozoic unconformity structure generally 24 77 Fault 70 79 cause washouts and significant inter-bed multiples and associated loss of 86 16 mimics the structure of shallower horizons that host the fields. 78 8N transmitted energy), and out-of-plane energy. Only two wells, the North 72 -5000 58 65 Therefore, for areas outside seismic control, where a shallower Map Symbols 38 -15000 26 32 57 75 21 Foreland St. #1 and OCS 0168 (Coho) #2, highlighted in green on table structure contour map was available, the general shapes of those 66 22 -10000 1, yielded synthetic seismogram to seismic ties of good quality to the top 8N elements were projected to the top Mesozoic unconformity surface. Fault - dashed where approximately located 29 61 15 Mesozoic unconformity. The remainder of the synthetic seismograms 28 -20000 14 Structure contour maps for some of the fields were not available 34 7N were useful in predicting the seismic character of the West Foreland 18 12 from AOGCC annual reports, but even in those cases, top Mesozoic Strike-slip fault 27 Formation. 83 19 Trace of Eagle River fault is simplified from unconformity contours were shaped to imply a structural high under Clark 31 20 Magoon and others (1976). the assumption that all fields discovered so far occur in structural Thrust fault - sawteeth on upper plate 7N 67 Border 0 37 Check shot velocity surveys were publicly available from two wells, traps. It is very likely that many of these structures have fault 56 35 River 71 OCS 0243 (Falcon) #1 and OCS 0086 (Guppy) #1, and are highlighted in Thrust fault - sawteeth on upper plate (seismic derived) 13 6N involvement, but where no seismic data was available, no faults ? yellow on table 1. Depth-variant velocities were calculated from the were mapped. 11 Normal fault (seismic derived) synthetic seismogram ties and from the measured check shots to generate 6N a depth and spatially variant velocity field. This field is highly under Uncertainty and Error -15000 Lake sampled from a full basin structural perspective, but was still helpful as a Fold axis - dashed where approximately located -5000 Kenai 5N Fault ? 60°30´ first pass depth-to-time conversion in projecting well formation tops onto Contours outside of the CI88 and CI89 two-dimensional seismic cover- 55 the seismic. Anticline Position of Bruin Bay fault is modified from age are dashed to indicate uncertainty. Contours outside seismic cover- 5N Eagle age with little well control have even higher uncertainties, and are desig- Magoon and others (1976). 54 Syncline 60°30´ Soldotna The following data and observations were integrated to generate the top nated with question marks. The absolute depth error at any given point 85 4N -15000 Mesozoic unconformity seismic interpretation: on the map is difficult to quantify and results from uncertainties in (a) the 84 depth pick in wells, (b) interpolation between and extrapolation away

Anticline 0 -20000 4N 36 ? • Time-to-depth relationships based on synthetic seismograms and from wells, (c) time picks on seismic, (d) variations in the seismic veloci- Bay Cook Kalgin 0 checkshot velocity surveys ty field, and (e) gridding, contouring, and smoothing artifacts, particu- Syncline Island 3N ? • Top Mesozoic unconformity well picks displayed in time larly in areas of sparse seismic and well control. 53 • Top West Foreland Formation seismic interpretation. This promi- -5000 nent seismic horizon is a short distance above, and generally con- Depth contours - dashed outside of seismic control; queried where inferred or doubtful 3N There is also a certain amount of spatial uncertainty regarding the inter- formable with, the top Mesozoic unconformity. Synthetic seismo- section of the top Mesozoic unconformity horizon with the Bruin Bay 2N -10000 ? grams at this horizon generally showed a significant decrease in and Castle Mountain–Lake Clark fault systems that bound the basin to Red line on location map above denotes area of seismic reflection data used in this study Bruin acoustic impedance, which should translate to a consistent strong the west. The fault traces (Magoon and others, 1976) indicate surface reflector on the seismic. Interpretation of this horizon helped guide expression, whereas the base Tertiary surface lies at varying depths. The -5000 2N ? Index contour (depth in feet relative to sea level datum) ? the underlying top Mesozoic unconformity pick. unconformity depth surface has been contoured as if the faults are single 1N • The top Mesozoic is sometimes an angular unconformity, and seis- vertical entities, but the reality is certain to be more structurally complex. ? Intermediate contour mic reflectors below it can have steeper dips, and be truncated by The magnitude of this spatial uncertainty depends on the dips and com- -10000 -15000

Seward Meridian Seward the unconformity surface. plexity of the faults as well as the depth of the base Tertiary surface. The Seward Base Line 36 Well with base Tertiary penetrations 1N Seward 0 deeper the surface and the shallower the actual fault dips, the larger the

1S Seismic time-to-depth conversion: Final two-way time seismic potential error. picks on the top Mesozoic unconformity were gridded to form a surface. Oil accumulation *Oil and gas accumulations are displayed for reference only. They are typically 8 Time values were extracted at well penetrations by piercing the time sur- located within the shallower Tertiary section, not at the mapped surface. ? Data Sources and References Cited 1S face with the well paths. The top Mesozoic unconformity depths at the Gas accumulation 9 -5000 well penetrations were divided by one-way time values to create 60°00´ Alaska Oil and Gas Conservation Commission (AOGCC), 2010, Annual -25000 -19000 -13000 -6500 0 ‘pseudo-velocities’, or average velocities from the horizon to the surface. -15000 ? Report and public well databases, http://doa.alaska.gov/ogc/. 10 Alaska Division of Oil and Gas, 2010, Alaska Oil and Gas Report 2009, 60°00´ 39 Vertical depth in feet 2S http://www.dog.dnr.state.ak.us/oil/products/publications/publi- Datum: Sea Level 3S Cook Inlet Stratigraphic Column cations.htm. 0 Canadian Stratigraphic Services Lithologic Logs,

Table 1. Depth to top Mesozoic unconformity in oil and gas wells (ordered by API Number). -10000 www.canstrat.com (choose log index for details). 3E Well locations, borehole logs, and deviation surveys from the Alaska Oil and Gas Conservation Commission. 3S Fault 2E Stratigraphy CGGVeritas CI88 and CI89 marine 2D seismic speculative data, Measured depth pick interpreted by the Alaska Division of Oil and Gas. -5000 87 www.cggveritas.com (choose Products & Services / Data Library for 4S Age (Ma) Measured True Vertical Measured True Vertical 44 Era Period Epoch Well Number API No. Well Name Well Number API No. Well Name details). Depth (ft) Depth, Subsea (ft) Depth (ft) Depth, Subsea (ft) -10000 0 Pliocene Magoon, L.B., Adkison, W.L., and Egbert, R.M., 1976, Map showing 1 50009100010000 ROMIG PARK INC - 1 2635 -2494 52 50283200360000 NICOLAI CK UNIT UNION - 5 8540 -8451 4S 45 Sterling 2 50009100030000 KNIK ARM ST - 1 3620 -3521 53 50733100090000 OLDMAN'S BAY ST - 1 11640 -11431 geology, wildcat wells, Tertiary plant-fossil localities, K-Ar age 3 50009100040000 LORRAINE ST - 1 7100 -6859 54 50733100150000 KALGIN IS ST - 1 14101 -14056 40 Miocene dates and petroleum operations, Cook Inlet area, Alaska: U.S. Geo- 55 50733100160000 DRIFT RIV ST - 1 5010 -4951 41 Beluga 4 50009100090000 J M NEEDHAM - 1 2121 -1742 5S 20 5 50009100110000 WALLACE KNUTSON - 1A 3453 -3309 56 50733100240000 REDOUBT SHOAL ST 22064 - 1 14239 -14208 Tyonek logical Survey Miscellaneous Investigations Map I-1019, 3 sheets, 101 6 50009100120000 WASILLA ST - 1 2970 -2937 57 50733100260000 W FORELAND UNIT - 1 10912 -10812 0 Oligocene 42 scale 1:250,000. 7 50009200020000 FISHHOOK - 1 1950 -1230 58 50733100350000 W FORELAND UNIT - 4 11070 -11141 Hemlock 5S Magoon, L.B., Griesback, F.B., and Egbert, R.M., 1980, Nonmarine 8 50133100020000 NINILCHIK UNION - 1 12700 -12373 59* 50733100370000 STATE SRS - 1 16130 -16199 1E 40 ertiary 9 50133100030000 NINILCHIK UNIT MOBIL - 1 12183 -11946 60 50733100410000 MIDDLE RIV ST ARCO - 1 6954 -6873 T Cenozoic Eocene West Foreland Upper Cretaceous rocks, Cook Inlet, Alaska: American Association 10 50133100047000 DEEP CK - 1RDPB1 13780 -13143 61 50733100450000 KUSTATAN-UNION - 1 11737 -11373 96 11 50133100170000 NAPTOWNE UNIT - 24-08 14705 -14425 62 50733100520000 TRADING BAY - 1A 6010 -5983 43 6S of Petroleum Geologists Bulletin, v. 64, no. 8, p. 1,259–1,266. 12 50133100210000 SWAN LK UNIT - 2 5850 -5725 63 50733100560000 TRADING BAY ST - A-02 6605 -6291 88 Swenson, R.F., 2003, Introduction to Tertiary tectonics and 60 Paleocene Unnamed 13 50133100220000 SOLDOTNA CK UNIT - 22-32 13685 -13330 64 50733100590000 GRANITE PT - 1 11508 -11447 Top Mesozoic 14 50133100250000 SWAN LK UNIT - 1 11587 -11232 65 50733100770000 MIDDLE GROUND SHOAL ST SRS - 1 9049 -9005 6S sedimentation in the Cook Inlet basin, in Dallegge, T.A., compiler, Homer 1W Saddle Mtn Mbr 15 50133100280000 W FORELAND - 1 11494 -11404 66 50733100820000 MIDDLE GROUND SHOAL - A43-11 9712 -9549 3W Unconformity 2001 Guide to the Petroleum, Geology, and Shallow Gas Potential of 16 50133100290000 BIRCH HILL UNIT - 22-25 15220 -14992 67 50733200240000 FORELAND ST UNIT - 1 12035 -12001 80 Kaguyak the Kenai Peninsula, Alaska: Alaska Division of Geological & 17 50133100360000 PT POSSESSION UNIT - 1 14895 -14680 68 50733200310000 W TRADING BAY ST - 1 6251 -6211 7S Late 95 7S 18 50133101090000 SOLDOTNA CK UNIT - 341-04 11090 -10910 69 50733200760000 TRADING BAY ST - A-12 7255 -6275 -5000 Geophysical Surveys Miscellaneous Publication 128, 89 p., 1 DVD. Ranges-5000 19 50133101160000 HALASKO KING OIL - 1 11830 -11705 70 50733200960000 W FORELAND UNIT - 5 8585 -8494 Matanuska 7S Wilson, F.H., Hults, C.P., Schmoll, H.R., Haeussler, P.J., Schmidt. J.M., 20 50133101310000 SOLDOTNA CK UNIT - 12-16 12200 -12034 71 50733201280000 KUSTATAN RIV UNIT - 43-30 10440 -10362 0 59°30´ 100 21 50133101360000 SWANSON RIV UNIT - 34-10 12020 -11666 72 50733201300000 TRADING BAY UNIT - G-07 11205 -10422 4W Yehle, L.A., and Labay, K.A., 2009, Preliminary geologic map of the 22 50133101450000 SWANSON RIV UNIT - 34-16 12137 -11859 73 50733201340000 N TRADING BAY UNIT - SPR-04 9985 -9187 Cook Inlet region, Alaska: U.S. Geological Survey Open-File Report 23 50133200050000 MIDDLE RIV ST SHELL - 1 5250 -5124 74 50733201380000 MIDDLE RIV ST UNIT - 2 8080 -7792 94 8S Early 23W 8S 2009-1108, 2 plates, scale 1:250,000. 24 50133200300000 KUSTATAN RIDGE - 1 6686 -6592 75 50733201680000 TRADING BAY UNIT - D-17 11630 -10746 59°30´ 120 Cretaceous 25 50133200610000 SWANSON LKS - 1 12043 -11801 76 50733201730000 GRANITE PT ST 18761 - MUCI-1 13365 -12041 Zippi, P.A., 2006, Greater Cook Inlet stratigraphic palynology control 26 50133201540000 KUSTATAN RIV - 1 3828 -3780 77 50733201780000 TRADING BAY UNIT - G-19 12033 -10985 8S 8S Herendeen/ 27 50133201700000 JOHNSON SLOUGH - 1 6090 -6045 78 50733201940000 TRADING BAY UNIT - G-31 12476 -10459 2W Nelchina database and study: Biostratigraphy.com, unpublished proprietary 28 50133201770000 BACHATNA CK ST 36448 - 1 6170 -6138 79 50733201980000 TRADING BAY UNIT - G-32 11535 -10323 Seldovia report, 187 p. 29 50133202340000 BACHATNA CK UNIT - 1 3030 -2990 80 50733202140000 TRADING BAY ST - A-11 7180 -6924 9S 140 Neocomian 30 50133202350000 BACHATNA CK UNIT - 3 2825 -2765 81 50733202330000 N TRADING BAY UNIT - S-08 11730 -10745 9S Staniukovich 31 50133202360000 BACHATNA CK UNIT - 7 2597 -2555 82 50733203250000 W TRADING BAY - 1 8660 -8300 100 Augustine Island Late 9S Acknowledgments 32 50133202500000 W FORELAND ST A - 1 8606 -8549 83 50733203610000 S MCARTHUR RIV - 1A 12830 -12149 9S Naknek Seldovia 1W 33 50133202660000 W MCARTHUR RIV UNIT-INEXCO - 1 5746 -5707 84 50733203720000 BEARD ST - 1-11 11246 -11126 160 34 50133202930000 SOLDOTNA CK UNIT - 33-33 11601 -11446 85 50733204180000 STURGEON - 1 6894 -6830 5W (Approximate 99 Mesozoic Chinitna The authors gratefully acknowledge CGGVeritas for authorizing the use 35 50133203620000 WOLF LK ARCO CIRI - 1 13075 -12801 86 50733204280000 TRADING BAY UNIT - M-29 11191 -10340 Arch 36 50133203650000 FUNNY RIV ARCO CIRI - 1 16650 -16221 87* 50831100020000 STARICHKOF ST - 1 8750 -8682 Location Middle of CI88 and CI89 Cook Inlet marine speculative 2D seismic survey in the ) 10S 180 Tuxedni 37 50133203750000 WOLF LK ARCO CIRI - 2 13350 -12738 88 50831100070000 COAL BAY ST - 1 3965 -3908 construction of this map. In addition, significant improvements were 10S 38 50133204320000 KUSTATAN-CHEVRON - 1 5190 -4866 89 50883100020000 TYONEK ST 17588 - 1 13200 -13111 10S Gulf of Alaska Jurassic 39 50231100010000 HAPPY VALLEY - 31-22 13209 -12580 90 50883100180000 N COOK INLET ST - 1 14220 -14291 made to the map thanks to the careful review and accompanying sugges- 40 50231100030000 ANCHOR RIV - 1 6720 -5224 91* 50883200050000 TURNAGAIN ARM UNIT - 1 4213 -4143 6W 1 2 8W 7W Early tions from technical reviewers P.L. Decker and R.G. Stanley . Valuable 9W 200 Talkeetna 41 50231100040000 N FORK UNIT - 41-35 11040 -10260 92* 50883200850000 N FORELAND ST - 1 15569 -15451 3 42 50231100050000 ANCHOR PT - 1 8974 -8719 93* 55219000050000 OCS 0168 COHO - 2 4052 -4001 assistance was provided by A.M. Loveland for metadata and for

43 50231100060000 FRITZ CK - 1 3580 -3425 94* 55220000010000 OCS COST LOWER COOK INLET - 1 2550 -2459 11S arranging a contract for digital topography. Finally, the map benefited 44 50231200020000 N FORK UNIT - 11-04 12120 -11007 95* 55220000020000 OCS 0097 RAVEN - 1 2595 -2505 11S Kamishak 11S 97 45 50231200030000 S CARIBOU HILL UNIT - 1 9964 -8047 96* 55220000030000 OCS 0086 GUPPY - 1 5010 -4965 Position of Border Ranges fault is highly uncertain between Seldovia and 220 Late greatly from the outstanding cartographic expertise provided by M.E. 1 46 50283100070000 STEDATNA CK - 1 7080 -6326 97* 55220000050000 OCS 0136 BEDE - 1 3505 -3427 Peters Creek-Eklutna area where it is concealed by Cenozoic units. Pritchard . 47 50283100080000 IVAN RIV UNIT - 44-01 15135 -15082 98* 55220000060000 OCS 0152 BOWHEAD - 1 3935 -3856 10W riassic 48 50283100300000 TYONEK ST 17587 - 2 12260 -12154 99* 55220000070000 OCS 0124 S ARCH - 1A 1350 -1271 24W Trace shown here is modified after Wilson and others (2009). Middle Border T 3 3 49 50283200010000 COTTONWOOD ST - 1 4140 -4061 100* 55220000080000 OCS 0113 IBIS - 1 670 -591 240 P.K. Davis and J.M. Robinson 12S 12S 12S Early Edited by: 50 50283200140000 CAMPBELL PT - 1 4315 -4252 101* 55220000090000 OCS 0243 FALCON - 1 1995 -1884 12S 51 50283200340000 W TYONEK - 1 6620 -6195 Redrawn from Curry and others (1993) and Swenson (2003). *Denotes wells with sonic and density logs. 30W 29W 154°00´ 27W 26W 153°00´ 17W 152°00´ 15W 14W 13W 12W 11W 151°00´ 150°00´ Affiliations Yellow denotes wells with publicly available check shots. Base from State of Alaska, Department of Natural Resources, The State of Alaska makes no express or implied warranties (including warranties for merchantability or Green denotes wells with good synthetic ties to seismic. Alaska Statewide Core GIS database. fitness) with respect to the character, functions, or capabilities of the electronic products or services or 1 Universal Transverse Mercator Projection Zone 5 North their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, Alaska Division of Oil and Gas GCS North American 1983 indirect, special, consequential, or other damages suffered by the user or any other person or entity whether 550 West 7 th Ave., Suite 800 False Easting: 500000.000000 False Northing: 0.000000 Quadrangle Index from use of the electronic products or services, any failure thereof or otherwise, and in no event will the Central Meridian: -153.000000 Scale Factor: 0.999600 State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic product or service. 153°00´ 150°00´ Latitude of Origin: 0.000000 Linear Unit: Meter Anchorage, AK 99501-3560 Township Range grid labels are relative to Seward Meridian and 61°30´ DGGS publications can be purchased or ordered from the Fairbanks office at: 61°30´ Email: [email protected] Base Line LIME TYONEK ANCHORAGE HILLS Scale 1: 500,000 Alaska Division of Geological & Geophysical Surveys 2 10 0 10 20 30 40 50 Miles 3354 College Road U.S. Geological Survey Fairbanks, Alaska 99709-3707 345 Middlefield Road LAKE SEWARD 60°30´ 60°30´ CLARK KENAI Phone: 907-451-5000 Menlo Park, CA 94025 10 0 10 20 30 40 50 Kilometers Fax: 907-451-5050 60°00´ E-mail: [email protected] 3 Alaska Division of Geological & Geophysical Surveys BLYING Web site: http://www.dggs.alaska.gov 59°30´ ILIAMNA SELDOVIA SOUND 59°30´ Map Location 3354 College Road Fairbanks, AK 99709-3707 153°00´ 150°00´ TOP MESOZOIC UNCONFORMITY DEPTH MAP OF THE COOK INLET BASIN, ALASKA by Diane P. Shellenbaum1, Laura S. Gregersen1 and Paige R. Delaney2 2010

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