From a 1929 book on Child's Geography:
"But the World still kept on cooling and cooling, and as it cooled it shrank and shriveled and wrinkled and crinkled and puckered like the outside of a prune. You know a prune was once smooth and round when it was a plum. These little wrinkles and crinkles rose up out of the ocean and were the continents and mountains, so you see how big the wrinkles and crinkles really are."
Two fossil imprints of the shells of Trigonia dug up today near the top of a hill in #Bath#Somerset#UK. These molluscs lived in the Jurassic Period at a time when even the hills in Bath were under water. The rock is (I think) Inferior Oolite. #Fossils#Mollusc#Fossil#Nature#Geology#Jurassic
Ranger Sarah views the Grand Canyon. The story of the formation of the Grand Canyon begins almost two billion years ago with the formation of the igneous and metamorphic rocks of the inner gorge. Above these old rocks lie layer upon layer of sedimentary rock, each telling a unique part of the environmental history of the Grand Canyon region.
Myron Cook: How Snowball Earth Leveled Mountains and Created the Great Unconformity
"Hike with a geologist and see spectacular exposures of the Great Unconformity and appreciate the profound history of earth." https://www.youtube.com/watch?v=LXzDfQyUlLg#Geology
TIL that not only is the Grand Canyon not the deepest canyon on land in the world, it’s not even the deepest one in the USA (where it’s third deepest!)
The deepest land canyon is in the Himalaya Mountains.
Some lava has spilled over the top of a defensive berm at the current Icelandic volcano. I don’t know at which point on the berms. The video is zoomed in.
Edit: it’s down near the sea to the east of Grindavík.
Ranger Sarah with the colorful Paria Mountains. The mountains comprise various sedimentary rock layers, each representing different geological periods. These layers have been deposited over 85 million years, creating a rich tapestry of colors and textures.
— at Grand Staircase-Escalante National Monument.
Ranger Sarah with another amazing view of the Rainbow Mountains. The vivid hues are attributed to the encrustation of iron oxides, manganese, cobalt, and others. These minerals have leached into the rock layers over time, staining them with shades of red, purple, yellow, and blue.
— at Grand Staircase-Escalante National Monument.
'The methods used to collect, interpret, and disseminate map data have been evolving ever since [Hawaiian Volcano Observatory's] founding in 1912, and a digital tool newly available to the public continues that legacy of innovation. The new digital tool is an interactive, browser-based display of map data that can be updated in near-real-time with eruption features, such as lava flows.'
The most surprising revelation from NASA’s Curiosity Mars Rover — that methane is seeping from the surface of Gale Crater — has scientists scratching their heads.