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In Colorado there is a formation called the Dawson Formation also known as the Dawson Arkose Formation. The most common fossil by far is petrified wood and although I haven’t found any vertebrate fossils from dinosaurs and mammals have been found. It covers a relatively large time span from late Cretaceous to early Eocene, about 70-54 million years old. A member that has also found fossils in this formation, Blake @FossilDudeCO. Although it has been over three years since he was on his posts have still helped. He said that further south is Eocene but higher north in Parker and Aurora is Cretaceous and from the cinnamon tree family. That’s all the basic info, now it’s time for the pictures. The next four are wet to show the color a bit better. The next three are polished via rock tumbler. The next image sparkles like sunlight on snow but you can’t really tell with a picture. While most are brown and black there are hints of color everywhere. Red, and clearly wet. Orange Yellow is mixed in a lot of them with a lot of it being a yellow brown or yellow white color. This is the only rock I have found with green in it. Very strange if anyone knows what any of these minerals are I would love to know. Blueish Purple grey Ill take pictures of more purple ones shortly. Here are just more pictures, Enjoy The largest piece, the first image, is my favorite and largest find being 8.1 pounds (3.7 kilograms). FossilDudeCO said in a topic, "It is thought that the trees fell into standing water and began to deteriorate that is why we don't see lovely rings or any more definition to the wood, rather just strange mashed up chunks and bright colors!" Which I am perfectly fine with. In case you didn't read between the pictures, if anyone knows what any of these minerals are I would love to know.