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The earth is constistitaly changing

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Age of Mammals

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the longest of all eras

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when dinosaurs thrived

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Precambrian

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Mesozoic

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the preserved remains of an organism

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living things die and their remains are covered by sediments

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The age when the rock is formed

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Study of follicles

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The Holocene is the current geological epoch. It began after the Pleistocene, approximately 11,700 years before present. The Holocene is part of the Quaternary period

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Epochs, Periods, Eras, Eons

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In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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A cast is a replica of something

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Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.

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Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice ( glaciers ), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils. Note : Limestone and shale are common sedimentary rocks.

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A metamorphic rock is a type of rock which has been changed by extreme heat and pressure. Its name is from 'morph' (meaning form), and 'meta'(meaningchange). The original rock gets heated (temperatures greater than 150 to 200 °C) and pressured (1500 bars). This causes profound physical and/or chemical change.

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a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself

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In geology, petrifaction or petrification is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals.

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the time we are currently in

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Paleozoic, Cenozoic, and Mesozoic

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law of superposition. noun. Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.

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Fossils forms in this layer

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A bug stuck in amber

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Paleontologist believe it is 4.6 Billion Years Old

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History of rock and fossils

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Relative Dating of rock layers tells us that the deeper we dig - the older the rock gets.

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Fossil is an impression left by the original organism - mold 

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Fossil is an impression left by the original organism - mold 

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A mold is the impression and void (space, hole) that an organism or organism's body or body part leaves in the sediment. ... A cast is made of different material than a mold. Both casts and molds are types of fossils. Sometimes the mold and cast are found together, although molds are more than casts.

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A fossil trackway is a type of trace fossil, a trackway made by an organism. ... Marine organisms also made many ancient trackways (such as the trails of trilobites and eurypterids like Hibbertopterus). Some basic fossil trackway types: footprints. tail drags.

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In geology, petrifaction or petrification is the process by which organic material becomes a fossil through the replacement of the original material and the filling of the original pore spaces with minerals.

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Organisms buried in sediment may decay or dissolve away leaving a cavity or mold. If the space is subsequently filled with sediment, an external cost can be made. Molds and casts are three dimensional and preserve the surface contours of the organism.

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In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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Uniformitarianism is a geological doctrine. It states that current geologic processes, occurring at the same rates observed today, in the same manner, account for all of Earth's geological features. Thus, it assumes that geological processes are essentially unchanged today from those of the unobservable past, and that there have been no cataclysmic events in earth's history. As present processes are thought to explain all past events, the Uniformitarian slogan is, "the present is the key to the past."