Publication Date:
2016-05-25
Description:
Members of the genus Bolboforma are marine microfossils
of generally spheroidal shape, whose tests
are composed of monocrystalline low-magnesium calcite,
and are believed to be derived from protophytic
algae. Bolboformids have been studied primarily in sediments
from the North Atlantic, the North Sea Basin,
and southern high latitudes; they range in age from
middle Eocene to early Pliocene. They have not been
observed in Pleistocene to Recent sediments. The geographical
distribution of the genus and the stratigraphic
occurrence of 42 Bolboforma taxa are outlined herein.
Thirteen biozones are defined. Bolboformids, as now
known, are distributed mainly in high latitudes. So far,
occurrences in low latitudes are rare. These microfossils
have considerable biostratigraphic value, mainly in high
latitudes, where they supplement the standard zonations
based on other microfossil groups.
This paper includes monographic, uniform descriptions
of all known Bolboforma taxa. New species are
Bolboforma atlantica, B. bella, B. compressibadenensis,
B. compressispinosa, B. furcata, B. geomaris, B. indistincta,
B. latdorfensis, B. micra, B. pustula, B. pentaspinosa,
B. praespinosa, B. robusta, B. subfragoris, and
B. subreticulata. Four taxa are left in open nomenclature.
Type:
Article
,
PeerReviewed
Format:
text
Permalink
