Adrian Raymund Cruz Fernandez

Tongji University

Allen Phonolite is the proposed name for a newly discovered alkaline igneous rock complex in Allen, Northern Samar composed of phonolites and phonolite porphyries. Phenocrysts are made up of large crystals of analcime and diopside. The fine-grained groundmass is composed of K-feldspar, analcime, diopside, magnetite with magnetite and apatite as acc...

The Catbalogan Formation is a sequence of alternating beds of mudstones, sandstones and pebble conglomerates extensively distributed along the road from Rosario to Mondragon, and Catarman to Calbayog in Northern Samar. Most of the mudstones contain calcareous nannofossils while sandstones have benthic foraminifera, coal stringers and fragments of m...

The present study reports on the distribution and occurrence of Braarudosphaera bigelowii in the surface sediments of the western part of the South China Sea (SCS), along the coast of Vietnam. This part of the SCS is a known upwelling region, characterized by low salinity conditions due to high annual rainfall and river run-off, confirming the resu...

Investigation of 4 samples from a 270 m section in Bagtic, Negros Oriental revealed the presence of well-preserved calcareous nannofossils indicative of Late Oligocene age. Based on the occurrence of marker taxa like Cyclicargolithus abisectus, C. floridanus, Reticulofenestra bisecta, R. daviesii; Discoaster deflandrei, Helicosphaera recta, Sphenol...

The paper presents the results of a calcareous nannofossil biostratigraphic study of 3 cores obtained from Indahag Limestone within the Laguindingan-Gitagum area in western Misamis Oriental, northern Mindanao. Based on the calcareous nannofossil assemblages and the occurrence of index markers like Discoaster pentaradiatus, Discoaster quadramus, Dis...

Biri Island off Northern Samar is known for its impressive rock formations made up of sedimentary rocks, as well as volcanic flow deposits and agglomerates. Analysis of 55 mudstone to fine-grained sandstone samples collected from five localities around the island revealed poorly-to moderately-preserved calcareous nannofossils. Despite the lack of d...