Syaiful explained that sedimentary layers do not form randomly. Sedimentation patterns may occur rhythmically or episodically and can be influenced by various factors, including tectonic activity, sea-level changes, climate, sediment supply, and accommodation space.<\/p>\n\n\n\n
These recurring and relatively consistent patterns can provide clues for tracing changes that have occurred within the Earth system. One of the factors studied is variation in Earth\u2019s orbit, which affects the amount of solar radiation received by Earth and subsequently influences the climate system.<\/p>\n\n\n\n
These variations are represented by the Milankovitch cycles, which include eccentricity<\/em>, obliquity<\/em>, and precession<\/em>. These astronomical cycles can leave patterns in sediments that are subsequently preserved in rocks.<\/p>\n\n\n\n \u201cThe main objectives of cyclostratigraphy are to understand the influence of astronomical forcing on the climate system during geological time, use astronomical cycles to establish astronomical age models<\/em>, and study past climate-change analogues to help us understand future climate change,\u201d said Syaiful.<\/p>\n\n\n\n According to Syaiful, this approach can be applied to various geological records, including sapropels, evaporites, fluvial sediments, red beds, and coal. The patterns identified must then be tested to determine whether they are related to astronomical cycles or were formed by other geological processes.<\/p>\n\n\n\n To test these patterns, paleoclimate data can be treated as a time series<\/em>. Analysis Fourier<\/em> or spectral analysis<\/em> can be used to identify frequencies within the data, while wavelet analysis<\/em> can be used to observe changes in frequency over time.<\/p>\n\n\n\n <\/p>\n\n\n\n The analysis can then be applied in astronomical tuning<\/em>, a process of matching patterns found in geological records with astronomical cycles. The results can be used to establish Astronomical Time Scales<\/em> (ATS) with greater precision in determining geological time.<\/p>\n\n\n\n For Geology and Geophysics students at FMIPA UI, this knowledge is important because Earth science research requires the ability to integrate various types of data to explain processes that occur over extremely long timescales. This ability also provides a foundation for interpreting past environmental changes, which can serve as a reference for studying changes occurring on Earth today and in the future.<\/p>\n\n\n\n During the discussion session, students also learned that not every recurring pattern found in rocks can immediately be interpreted as an astronomical cycle. Syaiful explained that such interpretations need to be validated using other datasets, including biostratigraphy.<\/p>\n\n\n\n Biostratigraphy can provide age constraints, allowing identified patterns to be correlated with specific periods of astronomical cycles. Through this approach, students learned that identifying cycles in rocks goes beyond observing patterns and requires validation using supporting data.<\/p>\n\n\n\n Nisrina, a 2023 cohort student of Geology at FMIPA UI, asked during the discussion about the criteria for selecting suitable sections for cyclostratigraphic research. According to Syaiful, sections containing relatively continuous and rhythmic sedimentary records are more suitable because they allow cyclical patterns to be observed more clearly. In contrast, geological disturbances or episodic sedimentation processes can make interpretation more challenging.<\/p>\n\n\n\n Learning about cyclostratigraphy is one of the ways FMIPA UI introduces students to analytical methods that integrate geology, paleoclimate, astronomy, and data analysis. This knowledge is essential for developing Earth science studies that not only explain how Earth formed and changed in the past, but also contribute to a better understanding of environmental changes occurring today.<\/p>\n\n\n\n <\/p>","protected":false},"excerpt":{"rendered":" Depok, 30 September 2026 \u2014 Perubahan iklim yang berlangsung saat ini tidak dapat dipahami hanya dari data dalam beberapa dekade terakhir. Rekaman perubahan lingkungan dan iklim yang tersimpan dalam lapisan batuan selama jutaan tahun juga dapat menjadi sumber informasi untuk memahami dinamika iklim Bumi. Kemampuan membaca rekaman tersebut dipelajari mahasiswa Fakultas Matematika dan Ilmu Pengetahuan […]<\/p>\n","protected":false},"author":1,"featured_media":18719,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,194],"tags":[],"class_list":["post-18718","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-berita","category-mipa-update"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"yoast_head":"\n![\"\"](\"https:\/\/biologi.sci-ui.id\/wp-content\/uploads\/2026\/10\/sci-967.jpg\")
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