Fossils

Master fossils & geologic time! This worksheet covers fossil types, rock layers, eras, and key geology principles.

Sort each fossil into the correct category. Original Remains An organism is preserved in its entirety Replaced Remains Remains that are slowly replaced, by rock forming minerals Trace Fossil Impressions left in rock by an organism Molds and Casts If an organism is buried in mud or other sediment and the fossil later dissolves out of the rock a mold remains How old is Earth? 4,600,000 Years 4,600 Years 4,600,000,000 Years 4,600,000,000,000 Years What is the only type of rock that can have a fossil? Igneous Sedimentary Metamorphic During which time period do humans (Homo Sapiens) live? Cambrian Quaternary Jurassic Carboniferous Earth's Eras Match each Era to its description. Precambrian Before most life Paleozoic Age of Invertebrates Mesozoic Age of Reptiles Cenozoic Age of Mammals Igneous rock found cutting through older rock is called a gap a fault an intrusion Match the geologist Match the theories with the geologists that came up with them. Nicolas Steno Law of Superposition Principle of original Horizontality James Hutton Principle ofCrosscutting Relations Uniformitarianism An organism often used as an index fossil is a horse triobite tulip Which of the following animal parts would be most likely to form a fossil? fur blood bones skin There was a force of compression that tilted sedimentary strata. What type of unconformity is this? Angular Unconformity disconformity nonconformity Glaciers melted and sea level increased causing an increase in weathering and erosion. What type of unconformity is this? Angular Unconformity disconformity nonconformity During the mountain building process, there is an increase in heat and pressure transforming sedimentary rock to metamorphic rock. What type of unconformity is this? Angular Unconformity disconformity nonconformity Rank the longest geologic time scale to the most specific. 1= the longest time scale4= the shortest and most specific time scale 1 (longest) Eon 2 Era 3 Period 4 (most specific) Epoch