The name of the area comes from the outcropping of sandstone which the wind has eroded into fanciful shapes resembling the turrets and towers of castle. This unusual formation has been luring visitors for thousands of years, and many of them left their mark in the soft sandstone--the area holds a treasure of Native American rock art, or petroglyphs. The most famous petroglyphs were done in the Castle Gardens Shield Style, the oldest recognizable example of the shield-bearing warrior figure type. It is described as "elaborate and carefully made figures," and it "combines several different manufacturing techniques that serve to distinguish the style as unique in the Bighorn and Wind River Basins. The style is also unique in that it depicts shields alone as well as shield-bearing warriors". 
First, the prehistoric artist prepared the rock surface by scraping the surface smooth, removing the less-consolidated exterior sandstone surface to expose the harder, inner layer for incising and painting. Next, the artist deeply incised the pattern of a circular shield or shield-bearing warrior. Incised images could have been made with a variety of stone, bone, antler or metal tools depending on the hardness of the rock surface. Also, abrading or smoothing the rock surface was likely done with a stone block or flattened cobble. Often, the shield is divided into quadrants or pie-shaped sections by incising geometric or animal forms. Once figures/ shapes were incised, the artist filled in the figures with several layers of paint. Colors include two shades of red (one more purple than the other), two shades of orange (one more yellow than the other), black, white and green. Polychrome painting and the use of green pigment is very rare in Wyoming and serve as distinguishing characteristics for the Castle Gardens shield style.
Castle Gardens Style shields are reliably dated between AD 1000 and AD 1250. At this point, very early in the Late Prehistoric Period, the identity of the authors of the shields is not certain. Archaeologists speculate, however, that migrating Athapaskan–speaking hunters and gatherers–known today as the Navajo and Apache–are good candidates for making the shields
The site was opened to the public and developed by the BLM in the 1960s as a recreation spot and promoted through the Wyoming State Highway Map, tourist brochures, and directional signs. It was believed that this would help protect the rock art images, which even at that time were being stolen and vandalized. Unfortunately, this accelerated the destruction. Also, foot traffic in front of the fenced off panels increased and created erosion which exposed previously buried cultural deposits. Vandalism has been a problem at the site for scores of years. Modern graffiti mars the sandstone, and in 1940, vandals chiselled the Great Turtle shield out of the rock. The shield was anonymously donated to the State Museum on Sept. 20, 1941, where it's been ever since.
When we arrived at the site, we were the only ones there - Imagine that! We spent some time there, but left since it was a very hot afternoon and after a long day, we want to come back on another much cooler day. 
I had to figure how to get back home so that we didn't have to retrace our drive out here. Unfortunately, my GPS system "Barking Bob" didn't even know where we were so I had to use my own internal GPS system which took us back to the major highway to Casper. Thank goodness since we apparently would not have had assistance from anyone other than cows.
Castle Gardens Style shields are reliably dated between AD 1000 and AD 1250. At this point, very early in the Late Prehistoric Period, the identity of the authors of the shields is not certain. Archaeologists speculate, however, that migrating Athapaskan–speaking hunters and gatherers–known today as the Navajo and Apache–are good candidates for making the shieldsThe site was opened to the public and developed by the BLM in the 1960s as a recreation spot and promoted through the Wyoming State Highway Map, tourist brochures, and directional signs. It was believed that this would help protect the rock art images, which even at that time were being stolen and vandalized. Unfortunately, this accelerated the destruction. Also, foot traffic in front of the fenced off panels increased and created erosion which exposed previously buried cultural deposits. Vandalism has been a problem at the site for scores of years. Modern graffiti mars the sandstone, and in 1940, vandals chiselled the Great Turtle shield out of the rock. The shield was anonymously donated to the State Museum on Sept. 20, 1941, where it's been ever since.When we arrived at the site, we were the only ones there - Imagine that! We spent some time there, but left since it was a very hot afternoon and after a long day, we want to come back on another much cooler day. I had to figure how to get back home so that we didn't have to retrace our drive out here. Unfortunately, my GPS system "Barking Bob" didn't even know where we were so I had to use my own internal GPS system which took us back to the major highway to Casper. Thank goodness since we apparently would not have had assistance from anyone other than cows.
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