The paleomagnetism and U-Th dating of Mexican stalagmite, DAS2

A 72 cm high stalagmite from Mexico, DAS2, has been analyzed for its paleomagnetism, and has provided a record of secular variation beginning about 1200 years ago to present. The stalagmite did not grow uniformly, and a low content of magnetic material has rendered the record less precise in some parts. A topographic test involving the magnetic measurement of coeval specimens from the sides of the stalagmite has shown that the record is …