Criticism of Dr. B. Mason's paper on “The origin of meteorites”

In a recent paper, Mason [1960] has presented arguments maintaining that ordinary chondrites originated from carbonaceous chondrites by a simple heating process, and that the chondrites were never part of larger objects. He criticizes views that the writer has advanced in the past, namely, that the minerals were formed in primary objects which were broken up and reaccumulated into secondary objects as broken fragments. It is certainly true that complete scattering of broken fragments over great distances and complete, thorough mixing has not occurred as he states and as was stated by Urey and Mayeda [1959]. However, the writer believes that his simple outline of events cannot be correct and that much more complicated histories are required.