The Alligator Effigy Mound is an effigy mound in Granville, Ohio, United States. The mound is believed to have been built between AD 800 and 1200 by people of the Fort Ancient culture. The mound was likely a ceremonial site, as it was not used for burials. Located on privately owned land, Alligator Mound is one of two extant effigy mounds known in the present-day state of Ohio, along with Serpent Mound in Adams County, Ohio. It has been listed on the National Register of Historic Places since 1971. Effigy mounds were built more often by ancient indigenous peoples located in the areas of the present-day states of Illinois, Iowa, and Wisconsin than in the Ohio area, and many have survived there. Survey history Squier and Davis: 1848 Ephraim George Squier and Edwin Hamilton Davis surveyed the privately held site in Granville, Ohio for the Smithsonian Institution and reported their findings in their 1848 publication Ancient Monuments of the Mississippi Valley. They described the site as "strange." They report the location of the work as being 150 to 200 feet in height. They note that people in the area called it "the alligator," "although the figure bears as a close resemblance to the lizard as any other reptile." The head of the effigy points towards the southwest. The work totaled 250 feet in length from head to tail. The body was noted at 40 feet wide, and each leg was measured at 36 feet. They describe the ends of the paws as being "a little broader than the remaining portions of the same, as if the spread of those toes had been originally indicated." Squier and Davis note that the head, shoulders and rump of the effigy are higher than the rest of the body. The height of the mound ranges from four feet to six feet. In the middle of the effigy was a small mound, which they believed was used as an altar. Stones covered the altar, with marks from being lit on fire in the past. A graded way was made from the altar to the "top of the effigy." The graded way is ten feet wide. They note evidence of excavation in parts of the effigy with little disturbance to the site. Through excavation they determined that the site is made of clay and that the clay had been imported from another area. They also noted