Jenaro González Reyna worked with William Foshag while Foshag was studying the eruptions of Paricutín Volcano in Mexico, during the 1940's. He was the Chief Geologist for the Instituto Nacional para la Investigacioìn de Recursos Minerales (Mexico).
Source:
Library of Congress. NACO. Control Number: n 85803203
Edwards, J. D. (1955). Studies of some early tertiary red conglomerates of central Mexico (Geological Survey Professional Paper 264-H). Washington, DC: United States Government Printing Office. Retrieved from https://play.google.com/books/reader?id=MkDwAAAAMAAJ&printsec=frontcover&output=reader&hl=en
Related entities:
Foshag, William F (William Frederick) 1894-1956: worked with Reyna studying Paricutin Volcano in Mexico.