Callan Bentley 
In the White Mountains of eastern California, just west of the Deep Springs Basin (site of my coldest camping experience ever, followed by a memorable morning walk in the playa and discovery of a bat mummified by salt), there lies a classic field mapping location, the Poleta folds. Here’s what it looks like from Google … Read more
The charming rock hyrax, a cuddly-looking fellow whose nearest living relative is the elephant: This is in the coastal town of Hermanus, a lovely place for whale-watching, in season. We were there at the wrong season, but the hyrax provided a mammal sighting that made us happy. The little fellow seemed to really be enjoying … Read more
At the Three Rondavels overlook in the northern Drakensburg Mountains of South Africa, I saw this chunk of quartzite with a peculiar variety of Liesegang banding (iron oxide staining of the rock by groundwater): A short distance away, I found another example: In one key way, I liked this second example better, even though the … Read more
African penguins (formerly “jackass penguins”) at Boulders Beach, Simon’s Town, South Africa:
Here is a collection of creepy-crawlies I saw in South Africa: Big grasshopper/katydid orthopteran: Another big orthopteran (“locust”?), obviously beefier than the previous one: Beach roach (Blattodea): Mating true bugs (hemipterans): Here’s a big snail, too: And best of all? This solpugid! Solpugids are arachnids, but they are not spiders. Along with vinegaroons, scorpions, pseudoscorpions, … Read more
Elephant shrew Epauletted fruit bat Savannah baboon Vervet monkey Scrub hare Tree squirrel Woodland (?) dormouse Unidentified rat Cape porcupine (as roadkill only) Black-backed jackal Wild dog Banded mongoose Dwarf mongoose Small-spotted genet Spotted hyena African wild cat Lion Leopard African elephant Rock hyrax (dassie) Plains zebra Square-lipped (white) rhinoceros Common warthog Hippopotamus Giraffe African … Read more
Callan reviews the geology of the superlatively auriferous Witwatersrand Supergroup of South Africa, and then zooms in on a distinctive marker bed near the base of the sequence. The deformation in this particular banded iron formation (BIF) is an aesthetic wonder, as this suite of images reveal. The layer outcrops in the heart of urban Johannesburg.
Here’s my species list for the past three weeks: African penguin Cape gannet Bunch of gulls (didn’t bother differentiating them) Bunch of terns (didn’t bother differentiating them) Cape cormorant Reed cormorant White-breasted cormorant Cattle egret Little egret Grey heron Saddle-billed stork Marabou stork White stork Woolly-necked stork Hammerkop Greater flamingo African spoonbill African sacred ibis … Read more
Scops owl, Kruger National Park, South Africa Hi everyone! I’m back in the States. There will be more photos of wildlife and geology from South Africa to come in the days and weeks ahead, but this little fellow can be an appetizer for you. It was a great trip, but it also feels good to … Read more
While I was away in South Africa, both Brian Romans of Clastic Detritus and Evelyn Mervine of Georneys posted pictures of folds in quartzite of the Cape Fold Belt in southern South Africa. Well, I’m not going to be left out. Here’s a belated Friday fold for December 23, showing a bunch of sweet folds … Read more
With my new “macrogigapan” rig from Four Chambers Studio, I produced this image last week before I left on vacation: That sample measures 18.5 cm long, and is about 4.9 cm wide. Pretty good resolution, eh?
Here’s where to get yourself a copy: Smithsonian Institution Secretary, Charles Doolittle Walcott My visit to Walcott’s grave (alluded to in the video) is here. [youtube=”http://www.youtube.com/watch?v=armXHEa4PGo”]
A brief video review of two books presented in a cartoon format: Feynman, by Jim Ottaviani and Leland Myrick The Book of Genesis Illustrated, by R. Crumb [youtube=”http://www.youtube.com/watch?v=tsbcS2_ZAhg”]
Another Friday fold from the pre-GSA Superior Craton field trip: Happy Friday. I’m setting this to auto-post on the day that my wife and I arrive in Johannesburg to start our honeymoon. I hope everyone’s doing well in my absence.
…in an Archean schist within the Superior Craton. Same outcrop as the criss-crossing dikes I showed yesterday. We’ve got tourmalines on the plane of foliation in the Setters Schist in Maryland, too, but they aren’t aligned like these Canadian tourmalines; instead the Maryland ones are scattered willy-nilly across the plane of foliation, like pencils on … Read more
A pretty cool outcrop I saw on my pre-GSA structural geology field trip to the Superior Craton: Can you see what caught my eye here? It’s a nice series of cross-cutting relationships. A series of sedimentary rocks were sheared out and metamorphosed, transforming into schists with internal boudins, and then they were cross-cut by first … Read more
A heads-up: I’m leaving Wednesday afternoon for a 3 week trip to South Africa. My wife Lily and I are off on our half-year-delayed honeymoon (to be distinguished from our Canadian Rockies pre-honeymoon last summer mainly by its exorbitant cost and low levels of geology). We will be spending the day in downtown London, England, … Read more
… a brief glimpse of summer in the Rockies: [youtube=”http://www.youtube.com/watch?v=hbRx7W1nYUk”] Footage shot south of Blacktail Butte, in Jackson Hole, looking west towards the Teton Range, in Wyoming. July 2011. Gros Ventre River terrace in the mid-ground.
The Friday fold is found on a newly-opened section of road in West Virginia. Join Callan in checking out some synclines and associated faults in the Devonian-aged Brallier Formation.
This blog has been noticeably photo deficient lately! Time to remedy that. Today, I offer you a couple of shots of the Brallier Formation (shale / fine-grained sandstone) in West Virginia’s Valley & Ridge province, a few miles northwest of Moorefield, on the newly-opened section of New Route 55. The Brallier was deposited in a … Read more