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From this page it is possible to search for sites where tephra layers have been found. For example, my selecting Michoacán, all of the sites where tephra layers have been found in Michoacán will be listed. If you select Michoacán and the Paricutin Tephra, all of the sites where the Paricutin Tephra has been found in Michoacán will be displayed. By only selecting the Paricutin Tephra and not specifying a State, all of the sites where the Paricutin Tephra has been found will be shown.

which State:	choose a State... Colima México Michoacán
which tephra layer:	choose a tephra layer... Chimalpa Tephra Cuautl Tephra Grey Tephra Huitzilzingo Tephra Lower Almoloya Tephra (Lower) Lower Almoloya Tephra (Upper) Lower Toluca Pumice Miahuacan Tephra San Martin Tephra Techuchulco 1 Tephra Techuchulco 2 Tephra Tephra I Tephra II Tephra V Tlahuac Tephra Tlapacoya 1 Tlapacoya 2 Tres Cruces Tephra Tx4 Tephra Upper Almoloya Tephra Upper Toluca Pumice

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