It is (as you might suspect) sand-colored and coarser than shale or mudstone.įor this reason, the rock is more porous than the other stones on this list and less likely to contain fossils.Ī more porous rock is more likely to have water seeping in and erode any fossil. SandstoneĪs the name implies, sandstone is condensed sand. Trilobites are hard-shelled invertebrates that lived 550 million years ago.Īgain, you can purchase the fossils on their website if you don’t want to go to Utah. The fossils you are most likely to find are trilobites. Longer stays cost more, but hounding tools are provided. It is located 52 miles west of Delta, Utah.įor $33, you can dig there for fossils for two hours. One place you can find shale fossils is at the U-dig fossils site in Utah. It can typically be found near oil deposits or contains oil in them. Organic materials, like shells, commonly get stuck between the layers and fossilize. This splitting is due to being laminated or made up of many layers. The difference between it and mudstone is that it is fissile.įissile means that it tends to split into flat layers. Shale is another fine-grade sedimentary rock found at the bottom of ancient seas and lakes. If you don’t want to journey all the way to England, you can purchase these fossils online. Ravenscar is considered a Site of Special Scientific Interest, so you can’t hammer into the rock without permission. They contain fossils of shells of ammonites, a relative of squids and cutter-fish. This deposit is from the Jurassic period, about 180 million years ago. One of these places is Ravenscar, North Yorkshire in the United Kingdom. Mudstone can be found in dried-up lakes or sea beds. It is also smooth to the touch and varies in color.Ī mudstone’s fine grade actually protects the fossils from erosion, which is why fossils are so common. It is usually soft and lacks any layering. Mudstone is a fine-grade sedimentary rock created from hardened silt and clay. Today we will go over the types of rocks that contain fossils and where you can find these rocks. Because of this, fossils are a great addition to any rockhound’s collection.īut, where do you find these fossils, and what kind of rocks can I find them inside? The history of life on our planet and the many changes it has been through are fascinating.
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