METHODS FOR IDENTIFYING IMPACT CRATERS/STRUCTURES
by: Charles O’Dale
Impacts produce distinctive shock-metamorphic effects that allow impact sites to be distinctively identified. Such shock-metamorphic effects can include:
- GEOMORPHOLOGY – One of the first indicators of a possible impact site is “circular geology”.
- SHATTER CONES – Shatter cones are distinctive striated conical fractures that are considered unequivocal evidence of impact events.
- FRACTURED ROCK – While travelling toward impact sites I documented fractured rocks increasing in magnitude as we neared the crater site.
- GRAVITY ANOMALIES – Gravity contours illustrate anomalies caused by fractured country rock under an impact site.
- MAGNETIC ANOMALIES – Magnetic studies document the magnetic disturbances within impact structures.
- SHOCK METAMORPHOSIM – The extreme pressures and temperatures at hypervelocity impacts have caused shock metamorphic effects on target rocks.