CRATER IDENTIFICATION

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.