Distribution of Microperforate Tenuitellid Planktonic Foraminifers in Holes 747A and 749B, Kerguelen Plateau

Abstract

Late Eocene to Pleistocene planktonic foraminifers from Leg 120 Holes 747A and 749B on the Kerguelen Plateau were quantitatively analyzed. Microperforate tenuitellid forms dominate the Oligocene to middle Miocene, and 17 species (including the new species Tenuitella jamesi and Tenuitellinata selleyi) are recorded.A lineage zonation of tenuitellid foraminifers is proposed as an alternative scheme for refinement of the Oligocene-Miocene biostratigraphy in high latitudes. Progressive or abrupt alterations in morphological characters within this lineage, producing different morphotypes or species, coincided with prolonged or sudden changes in paleoclimate. These microperforate planktonic foraminifers thus appear to have potential as indicators of cold-water masses and temperature fluctuations in post-Eocene oceans.

Integrated stratigraphy of the lower Altonian (Early Miocene) sequence at Tangakaka Stream, East Cape, New Zealand

“…Of potential significance is the LAD of Tenuitellinata angustiumbilicata. However, at DSDP Site 747A, Li et al (1992) placed this event well below the FAD of Globorotalia zealandica, whereas at Tangakaka the taxa co-exist.…”

“…15E), as well as Globigerinita naparimaensis, Globigerinita praestainforthi, Tenuitella clemenciae, Tenuitella jamesi, and Tenuitellinata selleyi. Li (1987) and Li et al (1992) pioneered the application of this group in Early Miocene biostratigraphy. Of potential significance is the LAD of Tenuitellinata angustiumbilicata.…”

Review and revision of Cenozoic tropical planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale

“…Secondary bioevents that have not been used include: The last appearance datum (LAD) Globoquadrina pseudofoliata (Chaproniere et al, 1994), first appearance datum (FAD) Globorotalia hirsuta (Pujol and Duprat, 1983), FAD Globoconella inflata (Berggren et al, 1995a), FAD Pulleniatina finalis (Chaproniere et al, 1994), LAD Neogloboquadrina atlantica (Weaver and Clement, 1987), LAD Globoconella puncticulata (Atlantic) (Zijderveld et al, 1991), LAD Globoquadrina baroemoenensis (Curry et al, 1995), FAD Globorotalia sphericomiozea and Globorotalia pliozea (Srinivasan and Sinha, 1992), LAD Globorotalia zealandica (Li et al, 1992), FAD Globigerinoides altiaperturus , LAD Globigerina labiacrassata (BKSA95), FAD Globigerinita boweni (Li et al, 1992), LAD Clavigerinella eocanica , LAD Subbotina linaperta (Wade, 2004), and LAD Planorotalites capdevilensis (Wade, 2004).…”

Palaeoenvironmental changes in the Transylvanian Basin during the Early Miocene revealed by the foraminifera assemblages

“…The palaeoclimatic sig nif i cance of cer tain plank tonic foraminifera spe cies was de duced based on di rect in for ma tion from the lit er a ture (e.g., Li et al, 1992;Spezzaferri, 1994Spezzaferri, , 1995Spezzaferri and AEoriae, 2001;Spezzaferri et al, 2002;Rögl and Spezzaferri, 2003;Bicchi et al, 2003Bicchi et al, , 2006Pearson et al, 2006;Alegret et al, 2008).…”

“…The plank tonic as sem blages from Tihãu are mostly dom i nated by spe cies in di cat ing cold-tem per ate wa ter and high pri mary pro duc tiv ity (Globigerina group; Globoturborotalita woodi; Tenuitellinata, Tenuitella, and Catapsydrax spe cies - Li et al, 1992;Spezzaferri, 1994Spezzaferri, , 1995Spezzaferri and AEoriae, 2001;Spezzaferri et al, 2002;Rögl and Spezzaferri, 2003;Bicchi et al, 2003Bicchi et al, , 2006Roetzel et al, 2006). Warm-tem per ate sur face wa ters are sug gested by the pres ence of Globigerinoides (e.g., Globigerinoides trilobus, G. primordius, G. quadrilobatus) and Paragloborotalia (e.g., Paragloborotalia continuosa, P. semivera) groups, and the spe cies Globigerina ciperoensis (Spezzaferri, 1994;Rögl and Spezzaferri, 2003;Bicchi et al, 2003;Amore et al, 2004).…”