This multidisciplinary research paper examines Genesis 8:1–12 which describes a critical late-Flood phase of the global Genesis deluge. Johnson and Clarey had previously performed a geological and exegetical analysis of Genesis 7 which documented the immediate pre-Flood events and the majority of the progressive inundation of the Earth from Day 1 through Day 150 (the high-water mark). The present analysis picks up at the beginning of Chapter 8, immediately following the high-water mark of the Flood at the top of the Zuni Megasequence, where the Ark comes to rest in the mountains of Ararat. At this point the Floodwaters began to violently recede off the continents in an important period of late-Flood runoff that created the sedimentary layers of the Tejas Megasequence (Paleogene and Neogene). The important segment of the Flood described in Genesis 8:1–12 encompasses 135 days of significant Earth-shaping activity and is responsible for producing approximately 33% of the total volume of the fossil-bearing layers of the geological column (Phanerozoic). This segment of the Flood is also responsible for the burying of numerous amounts of mammals, angiosperms, and many other plants and creatures living at higher pre-Flood elevations that are not found in lower (pre-Tejas) layers of the rock record.