Top Tweets for #TectonicHistory

about 1 year ago

In Geology ✔️ Mineralogy - Botany #CapeFlattery #WashingtonGeology #TectonicHistory #PacificNorthwest ❤️ 🔁 Unveiling the Rugged Majesty of Cape Flattery: Washington’s Northwesternmost Frontier Stand at the edge of the contiguous United States, where dramatic cliffs meet the Pacific Ocean’s relentless waves. Cape Flattery, Washington, is a geological marvel steeped in history and natural beauty, waiting to be explored. ▶️ Formation Story Cape Flattery, located at the northwestern tip of the Olympic Peninsula, was shaped by millions of years of tectonic activity, uplift, and erosion. Formed during the Eocene epoch approximately 44 to 42 million years ago, the region’s geology is tied to the collision of tectonic plates along the Cascadia Subduction Zone. The Flattery breccia part of the middle Eocene Lyre Formation, tells a story of rapid sedimentation during a period of significant plate reorganization, marked by the demise of the Kula plate around 42 million years ago. This tectonic upheaval caused regional uplift, exposing Vancouver Island’s lithologies, which became the primary sediment source for the breccia and conglomerate deposits found at the cape. Geological Information The geology of Cape Flattery is characterized by the Flattery breccia, a sedimentary unit within the Lyre Formation, composed of boulder- to sand-sized detritus deposited by high-density turbidity currents and sandy debris flows. These deposits suggest a dynamic depositional environment, possibly alluvial fan-deltas or submarine fan lobes, indicative of a steep, rocky shoreline during the Eocene. The sandstones are lithic arenites and wackes, poorly sorted with angular grains, pointing to rapid burial from nearby sources, primarily Vancouver Island’s Wrangellia, Crescent terrane, and Leech River Complex. Paleocurrent data indicate sediment transport to the south-southeast, consistent with the proximity of Vancouver Island. The region’s cliffs rising 120 feet above the Pacific, bear evidence of uplift and wave erosion, with benches just above the current waterline marking prehistoric sea levels. This interplay of tectonic uplift and relentless wave action continues to sculpt the cape’s rugged coastline, dotted with sea caves and stacks. ▶️ Interesting Fact Cape Flattery is the oldest non-Native permanently named feature in Washington, christened by Captain James Cook on March 22, 1778. He named it after the “flattering” hope of finding a harbor, only to be met with treacherous waters, a miscalculation that underscores the cape’s wild, untamed nature. 🔎 Have you visited Cape Flattery or another stunning coastal geological site? ❤️ 🔁 Like & Share your experience or tell us which natural wonder you’d love to explore next in the comments below! 🎞️ Cape flattery in Washington! https://t.co/MAK3dpIXc9

geologyBits's tweet photo. In Geology ✔️ Mineralogy - Botany
#CapeFlattery #WashingtonGeology #TectonicHistory #PacificNorthwest

❤️ 🔁 Unveiling the Rugged Majesty of Cape Flattery: Washington’s Northwesternmost Frontier

Stand at the edge of the contiguous United States, where dramatic cliffs meet the Pacific Ocean’s relentless waves.

Cape Flattery, Washington, is a geological marvel steeped in history and natural beauty, waiting to be explored.

▶️ Formation Story
Cape Flattery, located at the northwestern tip of the Olympic Peninsula, was shaped by millions of years of tectonic activity, uplift, and erosion.

Formed during the Eocene epoch
approximately 44 to 42 million years ago, the region’s geology is tied to the collision of tectonic plates along the Cascadia Subduction Zone.

The Flattery breccia
part of the middle Eocene Lyre Formation, tells a story of rapid sedimentation during a period of significant plate reorganization, marked by the demise of the Kula plate around 42 million years ago.

This tectonic upheaval
caused regional uplift, exposing Vancouver Island’s lithologies, which became the primary sediment source for the breccia and conglomerate deposits found at the cape.

Geological Information
The geology of Cape Flattery is characterized by the Flattery breccia, a sedimentary unit within the Lyre Formation, composed of boulder- to sand-sized detritus deposited by high-density turbidity currents and sandy debris flows.

These deposits suggest
a dynamic depositional environment, possibly alluvial fan-deltas or submarine fan lobes, indicative of a steep, rocky shoreline during the Eocene.

The sandstones
are lithic arenites and wackes, poorly sorted with angular grains, pointing to rapid burial from nearby sources, primarily Vancouver Island’s Wrangellia, Crescent terrane, and Leech River Complex.

Paleocurrent data indicate
sediment transport to the south-southeast, consistent with the proximity of Vancouver Island.

The region’s cliffs
rising 120 feet above the Pacific, bear evidence of uplift and wave erosion, with benches just above the current waterline marking prehistoric sea levels.

This interplay of tectonic
uplift and relentless wave action continues to sculpt the cape’s rugged coastline, dotted with sea caves and stacks.

▶️ Interesting Fact
Cape Flattery is the oldest non-Native permanently named feature in Washington, christened by Captain James Cook on March 22, 1778.

He named it after
the “flattering” hope of finding a harbor, only to be met with treacherous waters, a miscalculation that underscores the cape’s wild, untamed nature.

🔎 Have you visited Cape Flattery or another stunning coastal geological site?

❤️ 🔁 Like & Share your experience or tell us which natural wonder you’d love to explore next in the comments below!

🎞️ Cape flattery in Washington!
https://t.co/MAK3dpIXc9

Geology Bits of Knowledge

@geologyBits

about 1 year ago

In Geology ✔️ Mineralogy - Botany #TectonicInversion #TectonicHistory #Geology #EarthquakeRisk 🟥 "Earth, Unfiltered" unusual geologic behavior ❤️🔁 Tectonic Inversion is the geological process where a previously extensional (stretching) tectonic regime, like a rift basin, undergoes compression, causing normal faults to reverse their movement and form thrust faults or folds. This transforms sedimentary basins into uplifted or deformed regions. ▶️ Why Geologists study Resource exploration: It impacts the formation and trapping of hydrocarbons and minerals. Earthquake risk: Reactivated faults can trigger seismic activity. Tectonic history 🎞️Sandbox Experiment - Basin Inversion https://t.co/5DIj9fZA31

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