- 1. n. A name formerly given to certain Silurian brachiopod shells of the genus Spirifer. Source: opted
- 2. A name formerly given to certain Silurian brachiopod shells of the genus Spirifer. Delthyris limestone (Geol.), one of the divisions of the Upper Silurian rocks in New York. Source: webster
- 3. A name formerly given to certain Silurian brachiopod shells ofthe genus Spirifer. Delthyris limestone (Geol.), one of the divisionsof the Upper Silurian rocks in New York. Source: adambom
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delthyris
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