The Thesis Defense of Mr. Clarence Y. Magtoto was held on Dec. 7, 2018 at the NIGS Multipurpose Room. His thesis is on the Calcareous Nannofossil Bisotratigraphy and Paleoenvironmental Significance of the Occurrence of Chemosynthesis Mollusca in the Mudstone-Limestone Interbeds of the Northern Cement Corporation (NCC) Quarry in Brgy. Labayug, Sison, Pangasinan. His thesis adviser and reader is Dr. Allan Gil S. Fernando and Dr. Alyssa M. Peleo-Alampay, respectively. His thesis committee is completed by Dr. Noelynna T. Ramos and Dr. Leopoldo P. de Silva, Jr.