Spore-bearing land plants like ferns were always found before the occurrence of flowering plants. Radiometric dating Overview By their chemical nature, rock minerals contain certain elements and not others; but in rocks containing radioactive isotopes, the process of radioactive decay generates exotic elements over time. The discovery of radioactivity introduced another factor in the calculation. No great push to embrace radiometric dating followed, however, and the die-hards in the geological community stubbornly resisted. Biostratigraphy As geologists continued to reconstruct the Earth's geologic history in the s and early s, they quickly recognized that the distribution of fossils within this history was not random -- fossils occurred in a consistent order.
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