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