Table 2.

Biostratigraphical age, facies and palaeoenvironmental analyses of the Lonsio formation

Sample IDDepositional environmentMicrofaciesComponentsAge (PZ/LS)* (based on first appearance)
RTG 25Inner neritic, planktonic & shelf benthic foraminifera drifted/ reworked into volcanic deposits.Sparitic packstone of volcanic sediments rich in embedded planktonic foraminifera and rare larger benthic and algae fragmentsGloboquadrina altispira, Globoquadrina spp., Orbulina spp., Globorotalia margaritae, Globorotalia scitula, Sphaeroidinellopsis subdehiscens, Globigerinoides trilobus, Globigerinoides quadrilobatus, Globorotalia acostaensis, Fragments of rodophyte algae, Elphidium spp.N19/Early Th
RTG 26Inner neriticSparitic packstone of volcanic sediments with rare embedded planktonic foraminiferaGlobigerinoides spp.N4 and younger/Upper Te and younger
RTG 27Sparitic packstone of volcanic sediments with rare embedded planktonic foraminiferaGlobigerinoides spp.N4 and younger/Upper Te and younger
RTG 30Inner neritic, planktonic & shelf benthic foraminifera drifted/ reworked into volcanic deposits.Sparitic packstone of volcanic sediments rich in embedded planktonic foraminifera and rare larger benthic and algae fragmentsCatapsydrax spp., Orbulina universa, Globoquadrina dehiscens, Pulleniatina primalis, Globoquadrina altispira, Globorotalia globosa, Globorotalia humerosa, Globorotalia mayeri, Globorotalia scitula, Globigerinoides sacculifer, Globigerinoides quadrilobatus, Elphidium spp., Amphistegina spp., Heterostegina spp., Asterigerina spp.N19/Early Th
RTG 36Inner neriticSparitic packstone of volcanic sediments with rare embedded planktonic foraminiferaOrbulina universa, Globigerinoides spp., Globigerinoides quadrilobatus, Globoquadrina spp.N4-N19/Upper Te – Early Th
  • *We correlate the standard Planktonic Foraminiferal biozones (PZ) with the ‘Letter Stages’ (LS) of the Far East (as defined by BouDagher-Fadel 2008), relative to the biostratigraphical timescale (as defined by Gradstein et al. 2004)