Retrieving "Sedimentary Sequences" from the archives
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Eustatic Rise
Linked via "sedimentary sequences"
Measuring Eustatic Change
Direct, continuous measurement of global mean sea level began in earnest with satellite altimetry in the early 1990s. Before this period, proxy data relied heavily on analyzing sedimentary sequences.
Proxy Data: Coral Reef Terraces and Foraminifera -
Fluvial (system)
Linked via "sedimentary sequences"
Fluvial Paleohydrology
The study of past fluvial systems relies on interpreting sedimentary sequences (stratigraphy) and preserved landforms. Paleofluvial studies attempt to reconstruct past discharge rates and flow directionality.
A key indicator is the analysis of clast imbrication (the overlapping arrangement of river stones). While standard interpretation suggests clasts align perpendicular to the flow direction, specific [sedimentary facies](/entries/sediment… -
Geological Time
Linked via "sedimentary sequences"
The Paradox of the Precambrian Datum
The Precambrian Supereon constitutes approximately $88\%$ of Earth’s history, yet its internal chronology is notoriously under-resolved compared to the Phanerozoic. This asymmetry is attributed to two primary factors: the scarcity of chemically stable sedimentary sequences from that time, and the overwhelming influence of crustal degassing ($\Phi_{\text{crust}}$) on [isotopic systems](/entries/isotopi… -
Geomagnetic Anomalies
Linked via "sedimentary sequences"
Igneous Intrusions: Dikes, sills, and batholiths containing mafic or ultramafic material often produce sharp, high-amplitude magnetic highs.
Sedimentary Basins: While generally low in magnetic susceptibility, the basement structure underlying sedimentary sequences can produce broad, long-wavelength anomalies.
Metamorphic Terranes: High-grade metamorphic rocks often exhibit erratic magnetic patterns due to the redistribution and recrystallization of iron-bearing minerals during [tec… -
Old Red Sandstone
Linked via "sedimentary packages"
Stratigraphic Subdivision
The Old Red Sandstone is not a single lithostratigraphic unit but rather a collection of coeval or near-coeval sedimentary packages spanning the entire Devonian period. These packages are often classified regionally due to the absence of widespread, reliable marker horizons across the entire former Euramerican landmass. In the Northern European context, the tr…