A fin is a geological formation that is a narrow, residual wall of hard sedimentary rock that remains standing after surrounding rock has been eroded away along parallel joints or fractures. Fins are formed when a narrow butte or plateau develops many vertical, parallel cracks.

The Eocene Chuckanut Formation consists of a phenomenally thick sequence (9000 m!) of alluvial sandstone, conglomerate, mudstone, and coal, originally deposited in flood plains in subsiding basins near the coast of Washington- or at least, where the coast was around 50,000,000 years ago.

2019年3月26日 · People travel from all over the world to admire and photograph the thin, fragile layers of sandstone. The interesting shape and striking color of the Wave has made it recognizable worldwide. That’s why it’s so essential to be careful with sandstone formations. If the rock looks breakable, it is.

Sandstone "fins", eroded striations that depict how sandstone -- ancient compressed sand -- was laid down in layers over time. Now exposed, the layer erode at different rates, forming delicate "fins" that stretch for long distances. Sunrise light touches the Fins. Sandstone fins stand on edge.

2013年7月28日 · Sandstone fins are formed when sandstone domes, laid down in the ancient seas some 150 million years ago, collapse and are then eroded and weathered into a maze of vertical rock slabs. This...

2017年3月15日 · Fins are actually an intermediate stage in the erosion of sandstone. The fins may have started out as part of a plateau. Through the uplift of the underlying rock, deep vertical, parallel fractures to begin to be formed.

2021年2月10日 · Fins are actually an intermediate stage in the erosion of sandstone. The fins may have started out as part of a plateau. Through the uplift of the underlying rock, deep vertical, parallel fractures to begin to be formed. Weathering and erosion enlarge the fractures and the sandstone falls away until they form the shape that you see in this photo.

2013年9月20日 · Less that half a mile later, scramble up a gully and navigate cliff bands to reach The Stegosaur—a towering sandstone fin. Soak in views of jaw-dropping canyons from this prime vantage point before retracing your steps to the trailhead.

2016年12月22日 · From the Mormon Canyon paid parking lot, note the big sandstone fin ahead and to the right (northeast). The goal is to climb the large left-angling ramp up to the left/west side of the summit. There are two lower toes on the feature - one to the left and one central.

The Tower of Babel at the Courthouse Towers, narrow sandstone fins towering above the surrounding flatlands. Location: Courthouse Towers , Arches National Park, Utah Image ID: 18194