The Tillamook map area crosses a broad, northeast-plunging structural arch in Tertiary volcanic and sedimentary strata that form the northern Oregon Coast Range (Figure 1). The core of the uplift consists of Eocene basalt and interbedded marine strata which were previously correlated with the Siletz River Volcanics of the central Oregon Coast Range (Wells and Peck, 1961). In this study, the Eocene volcanics have been divided into five units, and a distinction is made between the lower Eocene Siletz River Volcanics and the overlying Tillamook Volcanics of late middle Eocene age. Marine mudstone and sandstone are interbedded with all of the volcanic units and comprise most of the late Eocene to Miocene stratigraphic section which forms the flanks of the Coast Range uplift. Continental shelf and slope sequences predominate in the basins flanking the Coast Range uplift."
Geologic Map of the Tillamook Highlands, Northwest Oregon Coast Range (Tillamook, Nehalem, Enright, Timber, Fairdale, and Blaine15 minute Quadrangles)
by Ray E. Wells1, Parke D. Snavely, Jr1, N. S. MacLeod2, Michael M. Kelly3, and Michael J. Parker4 Open File Report 94-21 1994
DData_Quality_Information: Logical_Consistency_Report Polygon and chain-node topology present. Completeness_Report complete Positional_Accuracy Horizontal_Positional_Accuracy Horizontal_Positional_Accuracy_Report "Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was compiled from 7.5' maps at a scale of 1:48,000 means that higher resolution information is generally not present in the dataset, although it may be useful locally at 1:24,000 in areas of closely spaced field observations. Plotting at scales larger than 1:48,000 generally will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data. Note that although the base map layers also have a resolution of 1:48,000, discrepancies between geologic contacts and topography may occur. The base map layers are provided for reference only. " Lineage Source_Information Source_Citation
TIM_GEO.PAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 AREA 4 12 F 3 5 PERIMETER 4 12 F 3 9 TIM_GEO# 4 5 B - 13 TIM_GEO-ID 4 5 B - 17 PTYPE 35 35 C - TIM_GEO.AAT COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 TIM_GEO# 4 5 B - 25 TIM_GEO-ID 4 5 B - 29 LTYPE 35 35 C - LTYPE 'contact, approx. located' 'contact, certain' 'contact, concealed' 'contact, inferred, queried' 'dike, Tib' 'fault, approx. located' 'fault, certain' 'fault, concealed' 'fault, inferred, queried' 'map boundary, certain'