Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 2. 1970-71. (Budapest, 1971)

rely visible because of the sediment filling the umbilicus). Surface reticulate, the last chamber smoother, more finely per­forated than the others. Note. Differs from the Globigerina tripartita group by having four chambers in the last whorl, and from G. eocaena in its apertural features. It may have been developed from G. tri­partita by gradual growth of the abortive chamber, during the Late Eocene. Occurrence. Common in the lower part of the Buda Marl (Cylindroclavulina cylindrica Zone); disappears in the Eo­cene/Oligocene transition. Budapest region, Büki: Mountains fo­reland. Globigerina liverovskae (Bykova) (Plate III. 13/a-c) Globigerina khadumica sp.n. - Bykova, I960. Tr. Vnigrl 193, Geol. Sbor. 5. P* 322 pi. 7. figs. 4-7. Globigerina liverovskae (Bykova I960) Samuel. 0. and Salaj , J. 1968. pp. 122-123, pl. 7, figs. 6/a-c, text fig. 24 AB. Description. Test very small, of only two whorls, with 3 to 5 1/2 chambers in the second one. Chambers loosely coiled, dorsal surface flat. Chambers slowly growing, inflated. Sutures deeply cut, radial, right. Umbilicus small and deep. A­perture usually not observable (due to poor state of conservat­ion). If yes, it is a low fissure from umbilicus to rim. Occurrence. Kenawy (1968) mentions this from in Hun­gary, from the Globorotalia opima Zone, under the name of Glo­bigerina postcretacea. It appears In the basal beds of the Buda Marl, and persists up to the Kiscell Clay inclusively. Common

Next

/
Oldalképek
Tartalom