The data is in the strata
The Treatise (Benson et al., 1961) suggests that Placentula has been replaced by ?Jonesites. These species were listed in Dalvé (1948) as species of Placentula. It is unknown whether these are indeed currently placed within Jonesites.
?Jonesites inornatum Ulrich
Occurrence: Economy
Reference: Dalvé, 1948
?Jonesites marginata Ulrich
Occurrence: Corryville
Reference: Dalvé, 1948
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