View allAll Photos Tagged Formation
Nonmarine black shale in the Triassic of North Carolina, USA.
The Newark Supergroup is a thick, geographically-widespread stratigraphic unit in eastern America. It is Late Triassic to Early Jurassic in age and represents sediments and some lava flows that filled up old rift valleys roughly paralleling the modern-day Eastern Seaboard of America. The rift basins formed in the Triassic when the ancient Pangaea supercontinent attempted to break apart, but failed. A successful breakup of Pangaea occurred during the Jurassic. Most of the basin-filling rocks are terrestrial redbeds - hematite-rich siliciclastic sedimentary rocks, such as conglomerate, sandstone, siltstone, and shale, deposited in nonmarine environments.
Seen here are nonmarine black shale pieces. The original muddy sediments were deposited in a lake in the Dan River Basin (Danville Basin), a half graben rift valley. The rocks are fossiliferous - seen on this visit were conchostracans, ostracods, vertebrate bones, coprolites, an apparent insect wing, a possible insect egg capsule, and plants.
Stratigraphy: Cow Branch Formation, Newark Supergroup, Upper Triassic
Locality: Dan River North Outcrop - roadcut on the eastern side of north-bound Route 220, just north of the bridge over the Dan River, east of the town of Madison, central Rockingham County, northern North Carolina, USA (36° 23’ 19.25” North latitude, 79° 56’ 27.48” West longitude)
-----------------
For more info., see:
Lovely cloud formations over East of England as we prepare to cross the channel en route to CDG
Air France A321
Take off for the air mobility demonstration.
Nyutabaru Air Base Open House
2007-12-02 Shintomi, Miyazaki, Japan
Pentax *istDS2
Les 18 membres de la formation initiale (FI) 48 poursuivent leurs apprentissages, avec une manœuvre à TerreAzur
Formation Cards to be selected and positioned on the Offensive side of
the board prior to Defensive alignment.
Intensely folded, thin-bedded, siliceous shale/mudrock of the Miocene Monterey Formation, Little Corona Beach, Corona Del Mar, City of Newport Beach, Orange County, California.
Four vintage Combine Harvesters head up the field at Rachels Harvest, an event put on to raise money for the Teenage Cancer Trust.
This was a weird cloud formation this evening at sunset. Took this through my bedroom window while on a conference call. That's multi tasking!
Looks best if you click to view larger
I recently spent a day with friends and family at AirFest 2010 at Lackland AFB in San Antonio. It was my kind of air show -- lots of high-performance jets. There were F-15s, F-16s, an F-18, and an F-22. In addition, the Thunderbirds gave a great show.
It's always interesting photographing aerial performances. The brightness of the sky can fool your camera's meter into underexposing. If there are lots of puffy, white clouds it's even worse and you're often left with blown-out clouds if you want to get the exposure correct on the planes.
For the shot above I can't even decide what exposure/treatment I like the best. Deep blue sky with slightly underexposed jets? Brighten everything up to lighten the jets? Use an adjustment brush to lighten the jets while keeping the sky deep blue (tried it -- doesn't look natural). You can see what I settled on above. In-camera I over-exposed 1/2 stop and increased the exposure a bit further in Lightroom. This is a shot which seems to vary quite a bit depending on the monitor you're viewing on so your mileage may vary.
I spent the day shooting with my all-purpose Sigma 18-250mm because I didn't want to lug my Canon 70-200 f/2.8 IS around. It did OK but there is noticeable vignetting in many of the shots and just doesn't match up with the Canon in sharpness (of course I didn't expect it to). I'll bring the Canon next time for sure.
Blue Angels and Thunderbirds practice the Super Delta Formation during joint training at El Centro NAF, Seely CA
Kraniche in Formation am 23.10.2016 über Bochum. +++ Foto: Lutz Leitmann / Stadt Bochum, Referat für Kommunikation
Eine aktuelle Bildergalerie mit herbstlichen Impressionen finden Sie unter www.bochum.de/C125708500379A31/vwContentByKey/W2AEVHAP505...
The Republic of Singapore "Black Knights" aerobatic team display their new F-16s at the Singapore Airshow 2014 to commemorate the 45th Anniversary of the air force.
Ashley Gorge is a popular picnic and swimming area north and inland from Christchurch City. The series of safe deep pools create an idyllic summer spot. The gorge also gives access to Mt Thomas Forest Park which features remnants of the native vegetation that once existed throughout the region. This includes native tawai/beech forest, scattered podocarp forests, tussock fields and Dracophyllum scrub.
Birdlife includes native species like pīwakawaka/fantail, korimako/bellbird, silvereye, miromiro/tomtit, riroriro/greywarbler, brown creeper, kererū/wood pigeon and tititipounamu/rifleman.
Meeting aérien de Francazal, Des étoiles et des ailes.
Avion Aero Vodochody L-39 Albatros.
The Geology of “A” Mountain
If you drive up Sentinel Peak Road, you will travel past a series of rock layers that formed between twenty and thirty million years ago. These multicolored strata produce the bedrock that constitutes “A” Mountain as well as the nearby Tumamoc and Powder House Hills. These hills and “A” Mountain are the visible remains of a former landlocked peninsula that was anchored in the west by the Tucson Mountains and extended beyond the present day Santa Cruz River to the east. “A” Mountain is an erosional remnant of this land prominence sculpted by the forces of ice, wind and water. Four distinct and interesting rock layers are easily visible on the face of this 550-foot mountain.
Flowing lava created the dark red rock strata at both the top and the bottom of “A” Mountain. Nearby volcanic pipes and fractures supplied the basaltic magma that created these beds, each one separated by a span of nine million years from the formation of the other. None of this lava came from the large “volcano like” crater on the northeast side of the mountain. Quarrymen from the Griffith Construction Company dug this basin at the turn of last century in the pursuit of its stone, used for building Tucson homes, walls and other structures.
The dark red color of these two basalt layers is due to a high concentration of iron and magnesium in the original magma. These elements reduce the lava’s viscosity and the explosive tendency of the sourcing eruptions while allowing the molten rock to flow more uniformly across the surface. Much of the basalt layer at the base of “A” Mountain contains small cavities known as vesicles. The magma, in this case, erupted out of the ground just fast enough for the dissolved gasses to vaporize in the decompressing molten rock and then cooled fast enough to retain the holes formed by these gas pockets. The same bubble forming principle occurs when opening a bottle of beer. An example of this vesiculated basalt is visible on the west side of Sentinel Peak Road between the parking lot at the bottom and the beginning of the one-way road around the summit. The basalt cavities are at the top of this dark layer, presumably because the bubbles floated upward before the cooling lava locked them in place.
The two rock layers sandwiched between the basalts were the result of more violent volcanic activity about 27 million years ago. The older of these two light colored rock strata is composed of rough dark pebble size cinders (basalt) embedded in silt, sand and ash. This material fell from the sky in the form of a volcanic cinder fall. The light brown agglomerate layer with its dark embedded pebbles is visible on the left side of the one-way lane just beyond the split in the road.
Finally, the most visually striking layer of “A” Mountain is composed of tan and pink rock, known as tuff. This layer resulted from one or more volcanic ash falls. The magma for this ash also went through decompression near the earth’s surface. In this case, however, the eruption occurred so suddenly that the expanding gas in the magma shattered the molten minerals and rock into very fine pieces and threw them forcefully into the air. After settling back to the ground, the combination of heat, pressure and time welded this bed of ash into the light colored rock layer that we can see today. Look for a sharp color transition between the tan rock and pink rock as you drive up the southern slope of “A” Mountain. This will identify the tuff layer that is also visible as a large light horizontal bed on Tumamoc Hill to the west.
This introduction to the geology of “A” Mountain is an invitation to explore and enjoy our hilly community with an understanding of its primordial past. The vestige of this beginning is locked within every pebble and stone of our iconic mountain.