Abstract
Palynomorph is a dust-sized material that is resistant to strong acids which can reflect the age and environmental conditions when a rock was formed. Batuasih Formation is one of the oldest rock formations in Bogor Basin which is rarely interpreted, especially from its palynological aspect. This study aims to see palynomorph characteristics, relative age, and environmental conditions in Batuasih Formation. There are several steps in conducting the research. Field activities by measured stratigraphic sections and sampling every 5-meter intervals or each lithological changes, laboratory activities by sample preparation using acid treatment method, identification were carried out using CX-22 binocular microscope, and laboratory analysis of age and depositional environment is drawn based on palynomorph associations that are present in rocks. The result found that palynomorphs were present in 8 of 10 samples (B.1, B.2, B.4, B.6 - B.10). One hundred seventy-three palynomorphs identified to consist of 20 different species. Dominant pollen came from genus Proxapertites, both Proxapertites operculatus, Proxapertites cursus, and Proxapertites psilatus. While dominant spores came from Verrucatosporites usmensis. Apart from pollen and spores, Palynomorphs in the form of dinoflagellates and foraminifera test lining are also present in this formation. Palynomorph analysis shows that Batuasih Formation has Late Eocene - Early Oligocene age (41.2 - 27.8 Ma) with transitional depositional environment.
Highlights
Java Island is part of Indonesia which is located in the primary Indo-Pacific environment and has very high rainfall and tropical climate (Dubois et al, 2014)
Dominant pollen came from genus Proxapertites, both Proxapertites operculatus, Proxapertites cursus, and Proxapertites psilatus
Seeing palynomorphs have wide distribution and complete evolution, they are suitable for determining relative age and environmental conditions of rocks, especially in terrestrial and transitional environments (Hillen, 1986; Larsson et al, 2006; Macphail & Cantrill, 2006)
Summary
Java Island is part of Indonesia which is located in the primary Indo-Pacific environment and has very high rainfall and tropical climate (Dubois et al, 2014). Its existence in the tropical region makes Java Island has a very high diversity of flora called mega-biodiversity. This diversity has continued to change, especially since the last ice age occurred in Indonesia (Kaars & Dam, 1995; Kaars & Dam, 1997; Kaars et al, 2001; Wibowo et al, 2016). Seeing palynomorphs have wide distribution and complete evolution, they are suitable for determining relative age and environmental conditions of rocks, especially in terrestrial and transitional environments (Hillen, 1986; Larsson et al, 2006; Macphail & Cantrill, 2006)
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