Three of my family members found this footprint in Lake Powell, Arizona last October 2020. They differ in what they say the size is from 4 to 12 inches, but my husband is probably the most reliable measurer and saying 12 inches. They looked for more quickly but did not see any. The photo of scenery has a person in a white shirt in the upper central middle in the shadows it was right there or right below there where they found it. A university professor has said it is prehistoric. I did minor searching for clues and the only thing I have so far is it may be a therapod (dilophosaurus?) from the