At the posted coordinates, you should find the marker for Susie and Cal Lavinder. Use their stone to get the final coordinates for this cache.
The cache is hidden at N 33 21.ABC W 97 09.XYZ
A = Number of letters in Susie's maiden name (in parentheses)
B = Third digit in year Cal was born
C = Month of Susie's end of life
X = Second digit in day Cal was born
Y = Day of month Susie and Cal were married
Z = Day of Cal's end of life
You can validate your puzzle solution with certitude.