Ranger Sarah spots the first set of Petroglyphs. These where made between 400-700 years ago. Stone chisels and hammerstones were used to chip away the desert varnish on the rock to expose the lighter color underneath.
— at Petroglyph National Monument.
Ranger Sarah learns the area is home to the Western Diamondback Rattlesnake (Crotalus Atrox). It is cold and wet out so Ranger Sarah hopes she won't be running into any.
— at Petroglyph National Monument.
Here is a 360° panorama captured by Curiosity at her current location, with North at center and South at both ends, on top of two large and small scale maps with her position.
There are many geological features in the panorama, can you find them in the maps?
Unlike Canned Heat (showing my age) it’s not bullfrogs but #woodlands that are currently on my mind. And feeling the need to respond to them creatively, and high on their phytoncides, here’s some #Origami#Trees made out of old #Geology#Maps superimposed with the occasional #Photo of the #Woods that inspired me. #DoubleExposure#Abstract
#China is home to around 200 #tiankeng, which are mostly distributed from the central #Shaanxi province down to the #GuangxiZhuang autonomous region in the southwest. Roughly 1/3 of the country consists of #karst — the highest proportion of overall surface area of any country in the world — compared with just under 1/5 in the United States.
View from the south to the Vercors plateau, Drôme, France. In the middle ground you can see the curved 'barre tithonique' (solid limestone of Upper Jurassic age). Behind that is the Lower Cretaceous limestone of the Glandasse (2041 m), which forms the edge of the Vercors plateau. #geology#fridayfold#foldfriday#france#alps
So, long #geology story long, I was driving the Modesto-Oakland leg of my weekend journey on Friday, and I accidentally went up Corral Hollow Rd instead of Patterson Pass. It was an interesting explore, although ultimately it dead-ended and I had to turn around. There’s a state park in there called Carnegie (really a rec vehicle place), so I checked out the butterfly situation. I crossed a wash several times, and I saw a lot of this material. At first I assumed it was old road tar, but it was weathering funny. I picked up a piece and discovered it was quite heavy, so I snagged a chunk and brought it home to clean. Seems to have a lot of feldspar - probably calcic. And mostly fine-grained mafics.
My guess is that I stumbled upon some un-serpentinized ultra-basic material from the Franciscan. I’ve heard it’s around, but in all my years of living in Northern #california I’ve never seen any in the field.
Anybody else know?
Subbottom profile from near offshore southeast Texas in the Gulf of Mexico showing a Pleistocene epoch filled Sabine-Calcasieu River trench below the Beaumont Unconformity, a dense clay layer that dates ~100ka, extending from the western Mississippi Valley to the Tamaulipas Range, NE Mexico. In SW Louisiana & eastern Texas it extends 100+ km inland. See ALT. #geology
There’s a gravity hole — a spot where the Earth’s gravitational pull is weaker — in the Indian Ocean, causing the sea level to dip by over 328 feet (100 meters). The anomaly has puzzled geologists for a long time, but researchers think they’ve found a credible explanation: magma. Read more from CNN: https://flip.it/CC.EAZ #Science#Geology#Asia#Ocean#IndianOcean
The crystallization of large replenished magma bodies is amazingly complex. The photos of layered rocks from the Bushveld Complex in this new #OpenAccess paper are mind-bogglingly wonderful 🤩 🤯 🤓 . The wider applicability of their conclusions might be disputed by some, but good stuff though! https://doi.org/10.1016/j.lithos.2024.107621#Geology#Igneous#LayeredIntrusions
Visit to the Adventure Mine, Keweenaw peninsula #Michigan, USA. 1.1 billion year old basalt flows that carry pure #copper. We experienced an underground blast from a safe distance around the corner! #geology#mining
#Eruption#Volcanos#Geology
Per the Guardian, the erupting volcano,
"Ibu is one of Indonesia’s most active volcanoes, erupting more than 21,000 times last year. "
Doesn't that translate to it erupted all year long? How are we defining an eruption if we can count multiple eruptions a day?
#OnThisDay, May 18, 1980, Mount St. Helens erupted in Washington state. It has often been declared the most disastrous volcanic eruption in U.S. history (depicted in St. Helens, 1981)
Ranger Sarah hike up onto the lava flow. The McCartys Flow is the most recent lava flow in the Zuni-Bandera Volcanic Field, and is one of thes youngest lava flows in the Southwest. It is approximately 3,900 years old.
— at El Malpais National Monument.
The latest eruption in Iceland stopped a few days ago after 54 days of activity.
However, land rise due to magma inflow underground of the Reykjanes Peninsula continues, and experts expect a new eruption soon. As they predicted, when the first eruption occurred on the peninsula a few years ago, this activity could continue for decades.