Swainellidae

EOL has data for 4 attributes, including:

first appearance
- URI: http://eol.org/schema/terms/FossilFirst
- Definition: The first appearance of this taxon in the fossil record.
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katian age
- URI: http://resource.geosciml.org/classifier/ics/ischart/Katian
- Attribution: International Chronostratigraphic Chart: http://www.stratigraphy.org/index.php/ics-chart-timescale
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number of fossil occurrences
- URI: http://eol.org/schema/terms/fossilOccPBDB
- Definition: The number of fossil occurrences in the Paleobiology Database (https://paleobiodb.org) that are identified as belonging to a particular taxon or any of its subtaxa.
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1