Figure F3. Example of the downcore variation in the shape of the 5°-7°2 peak and the presence (or absence) of the 10-Å illite peak (8.8°2). The downcore variation in peak shape reflects a downcore variation in the type and abundance of expandable clay minerals in the breccia matrix. A. Lithostratigraphic Subunit IVA (859.32 mbsf). B. Subunit IVB (874.23 mbsf). C. Subunit IVB (878.80 mbsf). D. Subunit IVB (879.51 mbsf). E. Subunit IVB (882.33 mbsf). F. Subunit IVC (885.16 mbsf). G. Subunit IVC (886.72 mbsf). H. Subunit IVC (887.87 mbsf). I. Subunit IVC (992.46 mbsf).