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You are watching: Which type of rock is most likely to contain fossils


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There room three key categories that rocks: igneous, metamorphic, and sedimentary. These categories exchange mail to exactly how the rocks form. Igneous rocks are formed when magma cools and hardens. Granite is a typical example that igneous rock. Metamorphic rocks form from various other rock that is subjected to a new extreme environment....


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There space three main categories the rocks: igneous, metamorphic, and sedimentary. These categories correspond to exactly how the rocks form. Igneous rocks are formed when magma cools and hardens. Granite is a usual example that igneous rock. Metamorphic rocks form from various other rock that is based on a brand-new extreme environment. Commonly, they form when rocks get buried deep within Earth"s crust and are exposed to too much heat and pressure. The rock never ever melts, but the heat and also pressure cause the mineral to adjust in together a way as the resulting absent is substantially different native the original. Marble is a common example that a metamorphic rock. Sedimentary rocks are created from great of sediment that room compacted and cemented together. These sediments deserve to come from various other rocks, dissolved minerals that space left behind ~ evaporation, or indigenous organic material from living organisms. Sandstone and limestone are usual examples the sedimentary rocks.

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Because sedimentary rocks room subjected come the least extreme atmospheres and type where life organisms are, they room the kind of rock the is most most likely to save fossils. This doesn"t typical that other rock species don"t have any fossils, simply that sedimentary rocks most typically have fossils. Because that example, imagine a mudslide wake up underwater in a lake or ocean. Countless plants and also animals get buried in this mudslide. Over time, the sediments compact and also cement and also become sedimentary rock. Traces of those living organisms that had actually been trapped in the mudslide will really likely be uncovered in that sedimentary rock. Through organisms ending up being buried in sediment they room able come be preserved as fossils. 

Let"s take it a journey through this rock through an example of the rock cycle. Imagine after countless years the sedimentary rock is eventually buried an extremely deep, subjected to extreme heat and temperature, and becomes a metamorphic rock. The too much heat and temperature may result in the lose of few of the fossils since of the drastic alters the absent went through. Fast forward millions of years more, and also this metamorphic rock it s okay subducted underneath an additional tectonic plate and also melts right into magma. The fossils are now lost forever, and when that magma ultimately hardens and becomes igneous rock, over there won"t be any type of traces of the fossils to be found. So, the factor that sedimentary rocks are most most likely to contain fossils is due to the fact that the setting in which they kind is most conducive come preserving evidence of life.