List of index fossils: Difference between revisions
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|[[Image:Viviparus glacialis - Rosmalen - Late Tiglian.jpg|120px]]|| ''[[Viviparus glacialis]]'' || [[Tiglian]] ([[Early Pleistocene]]) || 2.3–1.8 | |[[Image:Viviparus glacialis - Rosmalen - Late Tiglian.jpg|120px]]|| ''[[Viviparus glacialis]]'' || [[Tiglian]] ([[Early Pleistocene]]) || 2.3–1.8 | ||
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| || ''[[Calyptraphorus velatus]]'' || [[Tertiary]] || | | || ''[[Calyptraphorus velatus]]'' || [[Tertiary (period)|Tertiary]] || | ||
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| || ''[[Venericardia|Venericardia planicosta]]'' || [[Eocene]] || | | || ''[[Venericardia|Venericardia planicosta]]'' || [[Eocene]] || | ||
Latest revision as of 16:11, 8 June 2025
Template:Paleontology Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages). Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends. Another term, "zone fossil", is used when the fossil has all the characters stated above except wide geographical distribution; thus, they correlate the surrounding rock to a biozone rather than a specific time period.
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See also
References
- ↑ Index Fossils, from the US Geological Survey. Updated July 31, 1997.