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Geological Mapping Symbols
25
Flashcards
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Three short parallel lines with a longer line underneath
Sandstone Layer
A zigzag line
Fault Line
A series of small triangles pointing in the same direction
Anticline (upward fold)
A series of small triangles pointing in the opposite direction
Syncline (downward fold)
A combination of dots and dashes
Conglomerate Layer
Tightly packed small dots
Shale Layer
Array of small crosses
Metamorphic Rocks
Stylized wave pattern
Water Body
Uneven dotted line
Unconformity
Solid line with rectangles drawn perpendicularly
Limestone Layer
Outward radiating lines from a point
Volcano
Small solid circles
Drilling or Borehole Location
Solid and dashed line intertwined
Contact Between Two Different Rock Types
Gridded pattern
Plutonic Rock Body
Crossed hammers
Geological Survey or Sampling Area
Multiple small parallel lines
Slate Layer
Single horizontal line
Soil or Unconsolidated Material
Horizontal layers with wavy lines between
Bedding Plane Angle
Two lines converging into a triangle
Fold Axis
Series of parallel lines decreasing in length
Dip and Strike Symbols
Five-pointed star
Quarry or Open-pit Mine
Stylized sun symbol
Radiometric Age Dating Location
Ellipse with internal lines radiating towards the edges
Sinkhole
Simple cross-section drawing of a rock layer
Geologic Cross-section Line
Circle with a cross inside
Control Point or Benchmark
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