On a trip to Lowe's Cave, Washington County, Virginia, a group of six was descending a 45 foot scree slope when a 400 pound rock was dislodged. Everyone shouted "Rock!" and no one was hit.
NSS News, December 1988 (Part 2) V46N12, Page 483.
Jeanie London "Lowe's Cave" RASS Register July 1987, p 11.
No analysis has been done.