Iridium Anomaly is the asteroid-laden dust layer I often describe as “Dinosaur-killing cloud of extra-terrestrial dust from the K-T Band”, quoting Jim Broda.
Sediment from the first core taken that displayed a clear chemical signature … not big, but a tiny spike at the depth in the core of about 65 million years ago, called the Cretacious Tertiary Boundary. The sediment is from 30.44°19.9’ north, 157°49.4’ west, 3100 to 3115 meters deep. It’s from ship LongLines, cruise 44, October 1976, Leg #1.
The split core samples in the image show the dark area called “the injecta layer” and K/T Boundary.
I have this material because I made a gift to memorialize Charles David Hollister, which I gave to the Woods Hole Oceanographic Institution. A small amount of the sediment remains. For more information, search with keywords found in text here as well as the name Luis Walter Alvarez, a physicist awarded with a Nobel Prize in 1968.