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Rock with mineral intrusions. Most of the rock in Tucson is igneous which does not contain fossils. A small amount of Cretaceous sedimentary rock exists in the foothills of Mount Lemon. Outside of that, no fossils.

Why are there so many rocks that form into this exact shape?

Where are you from? No, most of the rocks here might not contain fossils – they ARE fossils – hundreds of thousands of them, from tiny to so gigantic that they are overlooked altogether. Look at the details and make note of all the similarities. Note the obvious patterns, matrices and curvatures. These are clearly not random. I am collecting almost identical specimens of different types, in various states of erosion, to show how they typically erode and what basic and similar shapes remain. I am now beginning to realize the vast scope and size of the ancient sea that covered the entire

region.

the patterns, curvatures and matrices are the result of mineral formation, like Bill said. not fossil. also, if an area is composed of igneous rock that means there are no fossils there, since igneous rock is volcanic in origin and the remains of organisms would get obliterated before any of them could fossilise.

you clearly come from a very interesting geological site, but alas none of those rocks were once living creatures.

Quartz veins.

Thank all of you for responding. I honestly don’t care whether or not what I have found are fossils. I just want to understand what I am observing and WHY it occurs. OK, there is a great deal of sedimentary rock where I live, and because it is so arid with little vegetation and because there is still some protected land around here, things of antiquity are well preserved and easily spotted by a trained eye. I am NOT near Mt. Lemmon. I am thinking on how to best present to you what I am observing and I will have to do that in future photos with communications. Not enough time right now. I can say, however, that I believe that much of what I am finding were once SOME kind of primitive living organism that always developed in the same manner, with almost identical patterns, helixes and matrices. I also see some rocks, of the same minerals present in my “intelligently designed” found rocks, that do NOT have patterns or matrices, so how is that explained? I am not a paleontologist or geologist or physicist, but I am a keen observer of detail and I love nature and science. To me, this is a mystery in plain sight that so far has not been explained to my satisfaction yet. Lookin’ forward to learning from you 🙂.

You should grab a basic geology text and read up. The rate of cooling and methods of deposition account for a lot of the variety of crystal structures. It’s easy to see at home with salt water. Make a concentrated solution and spread some thinly on a cookie sheet so it dries fast. Pour an inch or so in a cup and let it evaporate until it’s gone. Different structures but same ingredients. The basic shape of the pure substance will be similar though.

Wanna bet?