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Arizona Flash Flood Photographed Thanks to Website
DPS Ammonite posted a topic in Members' News & Diversions
A great website for near real-time stream flow rates and rainfall amounts in Maricopa County (Phoenix, Arizona area) led me to experience and photograph a flash flood in Scottsdale, Arizona. https://alert.fcd.maricopa.gov/alert/Google/v3/mobile.html I noticed about 3 feet and 2,000 cubic feet a second (cfs) of water was headed down Indian Bend Wash in Scottsdale. A short distance south there was 0 cfs. I positioned myself near Osborn Road, an unabridged crossing. Within a few minutes that Wash went from very minuscule to 2,000 cfs and eventually to about 3,900 cfs and almost 3 feet of water, more than enough to sweep away stupid motorists. First photo shows initial pulse that filled about 80% of the channel width in the distance. Second photo taken at the same time shows a downstream small bridge both taken at 6:58 PM. Three minutes later the flood overtopped the bridge. 7:06 the flood swept away many yellow golf balls. Three minutes later Osborn was covered in 1.5 feet of water; too much to make a safe crossing. Nearly three feet of water came down the Wash flooding a piece of paving equipment and caused a large filled trash container to float by. See gauge report that shows how quickly the Wash came up, but not quick enough for me to get out of the way. The next day I took a picture of the paving equipment that was flooded with nearly three feet of water. I was told that with a little prep it should start right up unlike a flooded family car. At Indian Bend Road at the Wash, water is diverted to spurt out of large metal horses; a giant art project. Nearby egrets and herons wadded in the water for tasty fish while ignoring the no swimming and fishing signs. In the last photo the heron snapped at and ate several large flying insects. 6:58 PM 6:58 PM 7:01 PM 7:03 PM 7:06 PM 7:07 PM 7:15 PM 7:17 PM 7:27 PM near maximum level 7:30 PM Next day Next day Next day heron fishing Heron ready to eat flying insects Gage at Indian School Road Map of rainfall that triggered flood.-
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This silicified lacustrine Miocene stromatolite is a trace fossil made by a gram-negative photosynthetic blue-green bacteria. The originally limestone stromatolite was formed as a bacterial mat trapped sediment and precipitated limestone as it grew from the lake floor towards the sun. It shows classic convex layering towards the top. The stromatolites occur in tuffaceous and lime rich lake sediments that might be part of the Chalk Canyon Formation that is bounded on the bottom by basaltic lava and volcanic rich conglomerate and sandstone on the top. Locally numerous silicified casts and molds of reed like plants, their roots, and palm wood occur in the lacustrine sediments. Since the area is under possible scientific investigation I will not give a more specific locality. The Arizona Museum of Natural History has fossils from the site per my showing them the site. The taxonomy is very unsettled as is the author of Cyanobacteria. Taxonomy per International Registry of Marine and Nonmarine Genera: https://www.irmng.org/aphia.php?p=taxdetails&id=110 See also: https://link.springer.com/article/10.1007/s10750-014-1971-9 “The cyanobacteria are named under Botanical and Bacteriological Codes, and the usage of both systems at the same time causes considerable confusion as the rules of the Botanical Code are quite different from those of the Bacteriological one.” Photo 1: detail of photo 2. Photo 2: 9” wide polished cross section cut and polished courtesy of Stan Celestian. Photo 3: 6” wide polished cross section of another side. Photo 4: top of colony. Photo 5: bottom of colony. Fossil Cyanobacteria & stromatolite overview: https://ucmp.berkeley.edu/bacteria/cyanofr.html Interesting paper that suggest Cyanobacteria created calcified structures because of interactions with viruses: White, R. A., 3rd, Visscher, P. T., & Burns, B. P. (2021). Between a Rock and a Soft Place: The Role of Viruses in Lithification of Modern Microbial Mats. Trends in microbiology, 29(3), 204–213. https://doi.org/10.1016/j.tim.2020.06.004 https://newsroom.unsw.edu.au/news/science-tech/stromatolites-–-fossils-earliest-life-earth-–-may-owe-existence-viruses
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