Usa los colores estandarizados (amarillo para arenisca, azul para caliza, verde para pizarra, rojo para intrusivos). Añade tramas (puntos, rayas) para mejorar la legibilidad.
In an undeformed sequence, the oldest rocks are at the bottom, and the youngest are at the top. This is your primary guide for relative dating within the section.
| Mistake | Correction | |---------|-------------| | Using vertical exaggeration for dip | Keep V:H = 1:1 for true dip angles. | | Ignoring strike direction | If section is not perpendicular to strike, use apparent dip formula: tan(δ’) = tan(δ) × sin(θ), where θ = angle between section line and strike. | | Extrapolating too deep without control | Limit depth to reasonable (e.g., 2× map scale). | | Misplacing faults | Faults are straight planes unless folded later. | | Wrong layer order | Always check superposition: younger on top unless overturned fold. |
Step 1: Draw the topographic profile
Plot elevations from contour lines onto the section line. cortes geologicos explicados y resueltos
Step 2: Mark surface geological contacts
Transfer where each rock unit meets the ground surface along the profile.
Step 3: Determine dip angles and directions
From dip symbols on the map (e.g., 30° SE), note the dip magnitude and azimuth.
Step 4: Project layers into the subsurface
From each surface contact, draw a line dipping at the given angle. Use a protractor or slope formula:
For true dip (α): Vertical drop per horizontal distance = tan(α). Usa los colores estandarizados (amarillo para arenisca, azul
Step 5: Extend layers until they intersect topography or other structures
Maintain consistent dip until a fault or fold changes it.
Step 6: Add fault lines
Draw fault planes at their mapped dip, then displace layers accordingly.
Step 7: Interpret folds (if any)
For anticlines: layers dip away from the axis. For synclines: dip toward the axis. Step 1: Draw the topographic profile Plot elevations
Step 8: Fill with patterns or colors
Use standard lithological patterns (dots for sandstone, bricks for limestone, etc.).
Step 9: Add legend, title, scale, and North arrow.