Which of the following has been found in association with the K-T boundary layer?
A) iridium
B) shocked quartz
C) tektites
D) all of these
E) none of these

Question

Quizplus · Accepted Answer

All three options (iridium, shocked quartz, and tektites) have been found in association with the K-T boundary layer. Iridium is a rare metal that is not commonly found on Earth's surface but is abundant in meteorites, which supports the theory that a massive asteroid impact occurred at the K-T boundary. Shocked quartz and tektites are both types of evidence of an impact event, with shocked quartz being created by the high-pressure shockwaves from the impact and tektites being glassy stones that have been ejected from the impact site and then cooled and solidified as they fell back to Earth.

Which of the Following Has Been Found in Association with the K-T