Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Cartographers use points on maps to denote localized features. On a geologic map, these locales can include: geochemistry or geochronology sample locations, important geologic units too small to show at map scale, wells or borings, or paleomagnetic sample locations.</SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Geologic maps frequently have little T-shaped symbols with numbers next to them. These symbols, known as attitude symbols, denote the orientation of planar and linear geologic features such as bedding, lineations, foliations, joints, faults, or other types of fabrics measured in rock outcrops. Geologists usually take these measurements using Brunton compasses. The long axis of the attitude symbol is rotated on the map to show the strike direction or bearing of the feature. The value next to the symbol denotes the dip or plunge of the feature. These attitude measurements help identify faults and folds.</SPAN></P></DIV></DIV></DIV>
Value: 8 Label: Approximate orientation of inclined bedding - Showing approximate strike and dip Description: N/A Symbol:
Value: 92 Label: Vertical or near vertical bedding - Showing approximate strike Description: N/A Symbol:
Value: 97 Label: Approximate orientation of overturned bedding - Showing approximate strike and dip Description: N/A Symbol:
Value: 98 Label: Approximate orientation of inclined bedding, where top direction of beds is know from local features - Showing approximate strike and dip Description: N/A Symbol:
Value: 13 Label: Inclined bedding, where top direction of beds is known from local features - Showing strike and dip Description: N/A Symbol:
Value: 14 Label: Overturned bedding, where top direction of beds is known from local features - Showing strike and dip Description: N/A Symbol:
Value: 15 Label: Vertical bedding, where top direction of beds is known from local features - Showing strike. Ball shows top direction Description: N/A Symbol:
Value: 71 Label: Inclined bedding in unconsolidated sedimentary deposits or unconsolidated fragmental deposits of volcanic origin - Showing strike and dip Description: N/A Symbol:
Value: 72 Label: Inclined foreset bedding in unconsolidated sedimentary deposits or unconsolidated fragmental deposits of volcanic origin - Showing strike and dip Description: N/A Symbol:
Value: 74 Label: Inclined topset bedding in unconsolidated sedimentary deposits or unconsolidated fragmental deposits of volcanic origin - Showing strike and dip Description: N/A Symbol:
Value: 75 Label: Inclined bottomset bedding in unconsolidated sedimentary deposits or unconsolidated fragmental deposits of volcanic origin - Showing strike and dip Description: N/A Symbol:
Value: 84 Label: Inclined flow banding, lamination, layering, or foliation in igneous rock - Showing strike and dip Description: N/A Symbol:
Value: 86 Label: Vertical flow banding, lamination, layering, or foliation in igneous rock - Showing strike Description: N/A Symbol:
Value: 82 Label: Inclined dike - Showing dip value and direction Description: N/A Symbol:
Value: 76 Label: Younger glacial striation or groove - Showing measured bearing and direction of flow. Dot indicates location of observation point Description: N/A Symbol:
Value: 22 Label: Inclined fold hinge of small, minor anticline - Showing bearing and plunge Description: N/A Symbol:
Value: 23 Label: Inclined fold hinge of small, minor syncline - Showing bearing and plunge Description: N/A Symbol:
Value: 40 Label: Inclined fold hinge of generic small, minor first-generation fold - Showing bearing and plunge Description: N/A Symbol:
Value: 43 Label: Inclined fold hinge of generic small, minor second-generation fold - Showing bearing and plunge Description: N/A Symbol:
Value: 45 Label: Inclined fold hinge of generic small, minor third-generation fold - Showing bearing and plunge Description: N/A Symbol:
Value: 47 Label: Inclined M-shaped minor fold hinge - Showing bearing and plunge Description: N/A Symbol:
Value: 49 Label: Inclined asymmetric (Z-shaped, clockwise sense of shear) minor fold hinge - Showing bearing and plunge Description: N/A Symbol:
Value: 51 Label: Inclined asymmetric (S-shaped, counterclockwise sense of shear) minor fold hinge - Showing bearing and plunge Description: N/A Symbol:
Value: 55 Label: Inclined fold hinge of generic (type or orientation unspecified) small, minor fold - Showing bearing and plunge Description: N/A Symbol:
Value: 62 Label: Inclined generic small, minor fold axial surface - Showing strike and dip Description: N/A Symbol:
Value: 64 Label: Inclined second-generation generic small, minor fold axial surface - Showing strike and dip Description: N/A Symbol:
Value: 99 Label: Small, minor dome Description: N/A Symbol:
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Cartographers use lines on maps to denote localized linear features. On a geologic map, these lines can represent a variety of geologic and geomorphic features, including eskers, glacial ice limits, terraces or fault scarps, cross section lines, shorelines, streams, supplementary contours, geophysical survey liens, flow lines on lava flows, and landslide movement directions.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>A fold occurs when originally flat surfaces, such as sedimentary strata, are bent or curved as a result of tectonic movements. The trace of the "fold axis" is commonly displayed on geologic maps. The fold axis is the line that traces the top or bottom curve of the fold. Folds can be small, measuring centimeters to meters across, or can be so large they may be viewed from space.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>A fault is a break in the Earth’s crust. Faults can be classified into three major categories, based on how the rocks on either side of the fault move relative to each other. Some examples include: normal, reverse, and strike-slip. Different map symbols are used to mark the different types of faults. </SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Dikes are vertical or near-vertical igneous intrusions, places where lava has shot up through the earth, fracturing the surrounding bedrock. Dikes are typically represented on a geologic map by a line, as they are most commonly seen as bands at the surface.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Contacts are lines that geologists use to mark the boundaries of geologic units. Line symbology will usually denote the confidence the author had in the location or identification of that contact. For example, a long dashed line indicates the location of a contact is approximate.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Sometimes geologists need to show the aerial extent of something that's not a geologic unit. Examples include areas of mineralization or alteration, fault zones, outcrops, geomorphic features, and extents of mineral resources.</SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>A geologic map classifies rocks and deposits into geologic map units. These units are displayed as colored or patterned areas on the map based on unique rock type, age, or depositional setting.</SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer shows all the quadrangles included in the compilation. Mapping of the whole state at this scale is still incomplete. As maps are published, they are compiled into the statewide database. It's important to note that for this compilation, no effort was made to make units match or align across quadrangle boundaries. The digital data is intended to be an exact replica of the publications by the original authors.</SPAN></P></DIV></DIV></DIV>