✦ On-land magnetic surveys accompanied the voyages of the "Carnegie" such as this one by sledge on Baffin Island, 1922. (Photo: Carnegie Archives)
Carnegie's special approach -- the role of DTM
Department of Terrestrial Magnetism (DTM) Director Rick Carlson has a good write-up from his Nov. 2017 Newsletter of the role played by Carnegie staff in the scientific community. Read it here.
DTM Geochemistry and Cosmochemistry Heritage
(starts in 1951 -almost 15 years before plate tectonics!)
The idea was to use the understanding of physics of elements that undergo natural radioactive decay to date different minerals in rocks using three isotope systems in the same rock. At the time, four big problems (below) were given as a reason to undertake the quest of geochronology.
Exhibit at Carnegie Institution headquarters, December, 1952
✦ A poster detailing the first mineral age work done at the Carnegie Institution. (Photo: Carnegie Archives)