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TheCrosswicks Clay is ageologic formation inDelaware. It preservesfossils dating back to theCretaceousperiod.^{[citation needed]}

• List of fossiliferous stratigraphic units in Delaware
• Paleontology in Delaware

• Various Contributors to the Paleobiology Database^[where?]."Fossilworks: Gateway to the Paleobiology Database". Retrieved17 December 2021.^{[user-generated source?]}

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