Puerco Pueblo petroglyphs

Left Albuquerque about 09:00 and drove west.  Stopped at the Petrified Forest National Park.  The main image as well as the first extra photo are petroglyphs.  Can anyone guess what the one above represents?

After that we drove to the Hoover Dam.  The second extra photo is Lake Mead behind the dam.  The last extra is the face of the dam.  And yes those electric towers are leaning.