Southwest Indian Ridge Chrons 1-23 plate reconstruction data: Southern ocean basin

Identifications of magnetic reversals from Anomaly 1 (0.77 Ma) to Anomaly 23 (~52 Ma) from a wide range of shipboard and airborne magnetic data from the Southwest Indian Ridge are embedded in three text files with fracture zone and transform fault traces that were digitized from best-available bathymetric and satellite gravity data. The three files contain all the data that were used to estimate the high-resolution rotation sequences for the Nubia, Lwandle, and Somalia plates relative to Antarctica described by DeMets et al. (2021). The data files are in ASCII text format and each has 10 columns that are described in detail in the 40-line-long data file headers. The data set was generated as part of a project called Toward an understanding of Neogene plate dynamics: Completion of a high-resolution, closure-enforced chronology of global plate motions since 20 Ma. Funding was provided through NSF award OCE14-33323.