You seem to have forgotten something later on in the biography.
"After five years of hard work, he published his famous and lavishly illustrated Bridgewater Treatise, “Geology and Mineralogy” in 1836. In his work, he discarded his earlier belief in the universal effects of the Biblical “Noah” deluge. His work detailed in color the geological history of the Earth, showing reconstructed fauna and flora from each geological time period".
"Buckland took great interest in the glacial theory of Louis Agassiz and, in 1838, he visited Switzerland to meet him and to examine rocks. He quickly became a convert to Agassiz’s theory, recognizing that “millions and millions” of years existed before the creation of the Biblical Adam and Eve".
Indeed. A very good chap.