Crayton Jeffery Yapp
March 01, 1949 - September 03, 2025
Obituary
Crayton J. Yapp passed away on September 3, 2025, at the age of 76. He will be missed terribly and remembered with undying love as the best husband, father and grandfather with a great sense of humor. He was kind, gentle, and a brilliant isotope geochemist and researcher as well as being a dedicated teacher. He earned his Bachelor of Science at UW-Madison and his Master’s and Ph.D. at the California Institute of Technology (Caltech). He was a professor of geology at the University of New Mexico for 15 years and Southern Methodist University in Dallas, Texas for 30 years.
Crayton is survived by the love of his life and wife of 51 years, Marilea; two precious children, Clifford (Sarah) and Karen; and beloved grandson, Theodore. He is also survived by his siblings, Philip (Nancy), Cheryl (Tom), Marcia (Maury) and Paul; as well as many nieces and nephews. He was preceded in death by his parents, Wayne and Audrey Yapp; and his brother, Lloyd T. Yapp.
A graveside service will be held at ST. IGNATIUS CALVARY CEMETERY in Mount Horeb at 1 p.m. on Tuesday, September 16, 2025. Following the service, there will be a gathering at Grundahl Park in Mount Horeb. Per Crayton’s wish it will be an informal gathering - BYOB and snacks.
Online condolences may be made at www.gundersonfh.com.
Gunderson Camacho Mount Horeb
Funeral & Cremation Care
500 N. Eighth St.
(608) 437-5077
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