Trace of antiform. Trace of synform. Mark the plunge in degrees and where space permits the azimuth (3 figs). Mark both as close to the arrowhead as possible. Draw approx. length in the precise azimuth direction measured. The tip of the arrow should be positioned on the measurement point. Boundaries Other symbols Younging direction.
REF NO DESCRIPTION SYMBOL CARTOGRAPHIC SPECIFICATIONS NOTES ON USAGE Anticline—Certain 5.1—Anticlines; antiforms ... Antiform, 1st type—Approximately located, queried Antiform, 1st type—Inferred ... Synform, 1st type—Approximately located Synform, 1st type—Certain Synform, 1st type—Approximately located, ...
12.2 Folding – Physical Geology – 2nd Edition
An upward fold is called an anticline (or, more accurately, an antiform if we don’t know if the beds have been overturned or not), while a downward fold is called a syncline, (or a synform if we don’t if the beds have been overturned). In many areas it’s common to find a series of antiforms and synforms (as in Figure 12.5), although some ...
Synform, Antiform, Neutral fold Syncline and Anticline. Cylindrical vs. Noncylindrical examples of noncyl folds: sheath folds, conical folds Geometry on fold profile plane: (section perpendicular to the fold axis) limbs, closure, hinge point, hinge zone, inflection point, interlimb angle, tightness,
Synform: fold where limbs dip towards axial surface Antiform: fold where limbs dip way from axial surface Monocline: gentle anticline-syncline pair with horizontal outer limbs
Geological Map Symbols inclined strata, dip in degrees horizontal strata vertical strata axial surface trace of antiform axial surface trace of synform fold hinge line, fold axis or other linear structure, plunge in degrees inclined cleavage, dip in degrees horizontal cleavage vertical cleavage geological boundary fault line, mark on downthrow side
1.5: Folds - Geosciences LibreTexts
If the limbs dip towards the hinge, then the fold closes downward, and the fold is a synform. Notice that if a fold closes ‘sideways’ so that one limb dips toward the hinge and the other dips away, it’s not possible to define it as either an antiform or a synform.
12.2: Folding - Geosciences LibreTexts
2024年4月24日 · An upward fold is called an anticline (or, more accurately, an antiform if we don’t know if the beds have been overturned or not), while a downward fold is called a syncline, (or a synform if we don’t if the beds have been overturned). In many areas it’s common to find a series of antiforms and synforms (as in Figure 12.5), although some ...
12.4: Measuring Geological Structures - Geosciences LibreTexts
2024年4月24日 · Figure \(\PageIndex{3}\) A depiction of an antiform and a dyke in cross-section (looking from the side) and in map view (a.k.a. plan view) with the appropriate strike-dip and antiform symbols. The beds on the west (left) side of the …
Describing Folds - antiform-synform - University of Leeds
Learn about antiforms and synforms, which are types of geological folds, and how to describe them.