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The geometrical construction of earth flexures in geological sections
The axial plane
2 other sections not shown
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anticlinal arc anticlinal sense apex Asmari Limestone asymptote attenuation auxiliary circle axial plane axis Bakhtiari Bakhtiari Series Beam compasses beds exposed Bisect Burmah CENOMANIAN centre O1 circular arcs clays competent fold construction crest crestal curvature deposition depth dip readings directrix draw the arc drawn earth flexures ellipse Eocene feet figure focal distances foci foresyncline Gamma Structure geological map geologist geometrical given point gypsum horizon horizontal plane hyperbola inch interpolated dip Irrawadi Lower Fars mark middle limb mile Miocene normal omega structure outcrop overfolding parabola plane table point of fact point of intersection position produced Prop proposition radii respectively right angles rock sheets sandstones Santonian scale section drawing shown South-western Persia steep flank steep limb straight line strata stratigraphic surface evidence survey synclinal arcs synclinal bend thickness of beds thrust sheet triangulation Turonian unit thickness Upper Fars upthrow block vertical