The San Juan (Spanish: Río San Juan), also known as El Desaguadero ("the drain"), is a 192.06 km (119.7 mi) river that flows east out of Lake Nicaragua into the Caribbean Sea. A large section of the border between Nicaragua and Costa Rica runs on the right (southern) bank of the river. It was part, with the lake, of a proposed route for a Nicaragua Canal in the 19th century. The idea of the project has been revived in the last decade, including the possibility of other routes within the country. The Ecocanal project has obtained a Concession from the National Assembly of Nicaragua to re-open the San Juan River to commercial barge traffic.
The archeological record along the San Juan River between Bluff and Mexican Hat is unsurpassed. World-class rock art panels and cliff dwellings are easily accessible. At the Sand Island launch site is a large, easily accessible petroglyph panel. At the confluence of Butler Wash and the San Juan River, rafters float past the famous Butler Wash Petroglyph Panel (also known as the Big Kachina Panel) with its well-known San Juan Anthropomorph figures dating to Basketmakers times. This is one of the most important petroglyph panels in the Southwest.
Rock paintings of Butler Wash Petroglyph Panel are similar to drawings in Horseshoe Canyon Utah. There we also can see certain beings in space suits, with antennas on the head. Most likely ancient artists in different places saw the same group of beings which schematically represented in rock paintings.
You can skeptically treats each of these groups of rock painting separately, but that that a certain similarity of robots was represented by absolutely different artists for many thousands of kilometers from each other has to set you thinking. We hope for it :)
The age of petroglyphs in Utah is dated age of 1200 B.C. The age of petroglyphs in Butler Wash Petroglyph Panel is unknown.