I was doing some rock hunting in in the desert, about the center of Utah and found these strange rock formations in the Mancos Shale of the late Cretaceous (Utah has plenty of strange formations). But these caught my eye because of spacing and alignment. When I looked closer it look like a fine sandstone with a few shell fragments, I thought of Stromatolite but did not see any laminations, When I was able use the internet I found out about Thrombolites and I am fairly sure that's what they are.