PLANKTONIC AND BENTHIC FORAMINIFER BIOSTRATIGRAPHY
Quantitatives (counting up to 150 specimens per sample) or semi-quantitatives analyses.
From Mesozoic to Present, everywhere in the world.
High-quality biostratigraphic and paleoenvironments interpretations.
Interpretation of recorded species is based on the global and/or regional biostratigraphic charts.
SELECTED FORAMINIFERA SPECIES
Angola, Kwanza Basin
Selected foraminifera species from Kwanza Basin, Angola
1. Laeviheterohelix glabrans; 2. Heterohelix sphenoides; 3. Muricohedbergella monmouthensis; 4-6. Acarinina bullbrooki; 7. Acarinina bullbrooki; 8. Acarinina collactea; 9. Acarinina pentacamerata (Subbotina); 10. Acarinina aspensis ; 11-12. Acarinina soldadoensis. Scale bars = 0.1mm.
CASE STUDY
Angola, (Kwanza Basin) & Myanmar (Salin Basin)
SAMPLE 1 – Kwanza Basin, Angola
Planktonic foraminifers:
Archaeoglobigerina cretacea, Contusotruncana fornicata (F), Heterohelix carinata, Heterohelix cf. globulosa (A), Heterohelix cf. labellosa, Heterohelix reussi, Globotruncana arca, Laeviheterohelix pulchra, Macroglobigerinelloides multispinus (A), Marginotruncana coronate, Marginotruncana marginata, Marginotruncana sinuosa – Contusotruncana plummeraetransition (F), Marginotruncana cf. paraconcavata, Marginotruncana sinuosa (F), *Marginotruncana cf. schneegansi, Muricohedbergella delrioensis (F), *Ventilabrella glabrata.
Benthic foraminifers:
Allomorphina sp., Astacolus sp., Bathysiphon sp.,Citharina sp., Ellipsodimorphina solida, Frondicularia mucronata, Gaudryina australis, Gaudryina cretacea,Gaudryina frankei, Gavelinella cf. monterelensis (F), Gyroidinoides sp., Haplophragmoides gr. eggeri, Hemirobulina bullata, Laevidentalina spp., Lenticulina spp., Marginulinopsis multicostata, Neoflabellina projecta, Reophax sp., Saracenaria sp., Vaginulina cf. plummerae.
Paleoenvironment:
Normal open marine, bathyal (upper slope).
ESTIMATED AGE : late CRETACEOUS – Santonian.
SAMPLE 2 – Salin Basin, Myanmar
Planktonic foraminifers:
*Cassigerinella chipolensis (F, FO at 33.9, LO at 10.89 Ma), Globigerina praebulloides (F), Globigerinita juvenilis, Globoturborotalita ciperoensis, Globoturborotalita gnaucki (D), Globoturborotalita ouachitaensis (F), *Paragloborotalia mayeri (FO at 28.1 Ma, LO at 10.46 Ma), Paragloborotaliacf. semivera, Tenuitellinatacf. angustiumbilicata, Tenuitella brevispira, Turborotalita carcoselleensis (RW).
Benthic foraminifers:
Ammonia koeboeensis(dominant), Angulogerinasp., Bolivinaspp. (A), Cibicidoidessp., Elphidiella? sp., Elphidiumsp., Globocassidulinasp., Gyroidinasp., Hanzawaiasp., Nonionsp., Sagrinellasp., Uvigerinellasp., Uvigerina tumeyensis.
Paleoenvironment:
Normal marine, shelf
ESTIMATED AGE : late Oligocene – Chattian, O6 zone.
Note : A = abundant, D = dominat, F= Frequent, RW= reworked