The debunking of the volcanic theory
was heartening news for the local people.
As evidence for the volcanic theory
, these scientists have maintained that volcanoes can bring iridium-rich rock from the Earth's mantle to the surface.
Proponents of the volcanic theory have suggested that the Deccan eruptions caused the K-T extinctions by spewing out sulfur and other volcanic material that darkened the skies, cooled the planet and produced acid rain.
Courtillot concedes that the shocked quartz remains a problem for the volcanic theory, but Officer disagrees.
Acid rain also plays a role in the volcanic theory
of the origin of mass extinctions, whose strongest proponent, Charles B.
In support of the volcanic theory
, on the other hand, Officer and Drake believe there is direct evidence for large-scale movement of magma to the surface around K/T time.