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high resolution sea floor mapping done in 2004 and 2005 by the us geological survey usgs and cal state monterey bay csumb reveals a field of gigantic sand waves just west of the golden gate of san francisco bay more than 40 large sand waves were mapped with crest to crest lengths of as much as 220 meters and heights of as much as 10 m eters although the tidal range is not huge here the narrowness of the golden gate straight augments the tidal force significantly tidal currents 2 5 m s note in perspective bathymetric images how the area directly under the bridge blue purple colors is kept clean of sediment here is a short synopsis from the usgs s website here is an article from the san francisco chronicle from last summer check this out for another submarine view of san francisco bay posted by brianr at 3 29 2007 0 comments labels geology marine science photos images sea floor image sf bay area tuesday march 27 2007 nature to launch a geoscience journal not sure if this has been blogged about yet i was pleasantly surprised this morning when i stumbled upon news that nature is launching a specialized journal called nature geoscience in january 2008 here s their description of it launching in 2008 nature geoscience will be a monthly multi disciplinary journal aimed at bringing together the most significant research across the entire spectrum of the earth sciences published monthly in print and online the journal s content will reflect the core subject disciplines and other related areas with direct links to earth sciences in addition to primary research nature geoscience will also publish review articles news and views research highlights about important papers published in other journals commentaries book reviews and correspondences nature geoscience will take an interdisciplinary integrated and balanced approach to all areas of geoscience and foster the exchange of ideas between scientists involved in different disciplines nature geoscience will be an invaluable resource for all researchers who are active in the process of discovering and developing an understanding of the earth environmental and planetary sciences i subscribe to the general nature journal and enjoy it quite a bit especially their review articles for the technical papers outside of my field like in genetics quantum physics astronomy etc but there s typically only about one or two earth science related papers per issue if that i m actually quite surprised it took this long for nature to get this going considering how important the disciplines of earth science are to the scientific community will this be a good thing for the science any thoughts posted by brianr at 3 27 2007 5 comments labels geology misc science giant selenite crystals some of you may have seen these photos they have been circulating via e mail over the last few weeks pretty amazing probably the largest selenite caso 4 2h 2 o crystals found i d imagine miners discovered them in naica mine chihuahua mexico note people for scale in photos posted by brianr at 3 27 2007 3 comments labels geology photos images from the perspective of a guy from buffalo at a tragically hip concert in san francisco this story is from the perspective of a guy from buffalo at a tragically hip concert in san francisco really the only way to see these guys is in a small and famous music club in san francisco and not in a giant arena in calgary don t get me wrong i love em but they are better suited to the smaller room this is by far the most concentrated collection of canadians in san francisco tonight maybe the most all year in the bathroom between the opening band and the hip a voice calls out who s from vancouver eh this is answered by go canucks from the opposite corner and slightly overlapping in timing go leafs go from right next to me in a clear combative tone a couple more crown and coke s and i would have added in my own 0 02 and screamed something clever like buffalo rules wooo the wooo is pretty standard really seems trite but how can you leave it out c mon the canadian national anthem was sung outside the club afterwards by competing packs of drunks waiting for their friends it was beautiful i wanted to pull the sweater over this guy s head next to me and start beating the crap out of him but in a fun and friendly way the kind of fun fight where the involved parties make sure to take care of their eyeglasses beforehand and do so with a giant and somewhat maniacal smile on their face although i never did find my friends the guys who flew down from calgary just for this show and they now have my coat from the coat check dammit even though they didn t play naughtical disaster the sabres have clinched a playoff berth all is well once in a while i stray from geo topics no worries it s just a random post posted by brianr at 3 27 2007 2 comments labels hockey music randomness sf bay area sunday march 25 2007 photographic summary of recent patagonia field work i am putting together a post about the general geology of the region of southern chile we work in what we are working on exactly etc but is taking a lot longer than i d like as most of you out there who do relatively long stints of field work you know how it is getting your non geology life back in order when you get home in the meantime here a some photos and superficial information about them and anecdotes from this year s session click on photos for hi res versions the above photo illustrates one reason why we travel so far to look at sedimentary rocks the exposure much of the stratigraphic section we are investigating is shale siltstone which does not typically create great outcrops in this area however the recent glaciation has cleaned up the mountainsides giving us a glimpse of these strata you ll notice in the bottom portion of this exposure an odd lens shaped area this section is riddled with deep sea mass wasting deposits slumps slides debris flow deposits etc the interior of that lens shaped area is chaotically folded and deformed syn sed soft deformation there are very few places in the world where this kind of syn sedimentary deformation is this well exposed the photo below is zoomed in a bit note the discordant strata in the lower half for this particular study area we were lucky to be able to stay in a nice little puesto a glorified shack where the gauchos stay when they are in the area tending to sheep see below not that i dislike camping but when working it is nice to come back to a roof and wood burning stove in the evening plus being able to drive to the puesto allows us to bring additional supplies i e wine up until this year all of the work i ve done in this area has been near but outside of the national park boundaries torres del paine a new student is starting a project looking at the structure and thermal exhumation history of the fold thrust belt this requires going further west into the more deformed part of the belt and thus towards the patagonia ice cap the 3rd largest continental ice sheet after antarctica and greenland i believe as you can imagine accessibility is a major issue the roads trails within the park remain the best way to access a lot of these rocks efficiently safely and cheaply so the bonus is the spectacular scenery the photo below is from our campsite early one morning if you ve ever read anything about this area you ve no doubt seen this image it is by far the most iconic image of this massif called los cuernos or horns the light rocks are the granitoid laccolith rocks intruding into the dark shales of the sedimentary sequence we are studying the sed sequence is upper cretaceous the laccolith is miocene i promise i ll get a post going putting all this random geo info into some context by the way the water in the foreground is essentially sea level and the top of those peaks are nearly 3 000 m 10 000 ft a little bit of relief another day we were sampling along a trail that led to glacier grey we of course had the proper permission and paperwork for sampling in the park but still got many curious and some dirty looks from tourists along the trail i suppose we may have been ruining their solitude by hammering away but hey tough break but most people were simply curious and once they find out we are scientists they will ask questions about the area this photo below is a view of the glacier during our lunch break the geologic map of this area that we have is from the late 1970s note the two rock islands at the glacier front the bigger one to the right and the much smaller to the left in the photo above the smaller one is not on the 30 year old map the glacier has retreated that much after this work me and one other guy set out for an excursion to a rather remote area in an area northeast of the park again i will post about the geography geology more properly sometime soon i ve been working in this area for 4 years but this was the first time to this particular area it required being horse packed in and camping for 10 days essentially a gaucho guide takes us in drops us off and then comes back on a specific day to retrieve us i shot this photo see below of the gaucho leaving the canyon we were in after dropping us off he was much more efficient in traveling once he got rid of the two gringos not necessarily master horseman and all the supplies this was one of the harder areas i ve worked physically we couldn t really get too close to the outcrop we wanted to work on with the horses due the the ruggedness of the canyon we were in so we had a 5 km cross country hike every day to the rocks about 4 hours by the end of the excursion we were not only in better shape but had found a good network of game trails that made the commute not so hard on our bodies now that i m sitting comfortably at home and not cursing my blistered feet and shaking a fist angrily at the weather gods i can say it was worth it the sedimentary sequence we were investigating in this area is important to the overall understanding of the basin fill because it is the record of delta progradation that eventually constructs the shelf and fills in the deep water foreland during the latest cretaceous so in a short sequence we saw turbidites intermingling with hummocky cross stratification wave base and deltaic deposits this is another student s research so i m not gonna steal his thunder by posting too much about it stay tuned on a nice day we got this view from the top of the outcrop photo above the tops of those mountains in the distance to the west is the patagonia ice cap it s a few km thick in that area or something like that stay tuned for a post with more geology and context for all of this posted by brianr at 3 25 2007 4 comments labels geology patagonia photographs i ve taken photos images turbidites friday march 23 2007 where on google earth 6 this is one of the prettiest deltas i ve found exploring around googleearth good luck posted by brianr at 3 23 2007 3 comments labels where on google earth thursday march 22 2007 back from field work safe and sound yet another field season in patagonia and i ve made it out alive and relatively unscathed although there s little to no jet lag involved with the journey from patagonia to california it is 24 hours of traveling and if you re like me and can t sleep on planes what a drag it feels about as bad as jet lag i will blog more about it and post some photos soon this weekend i hope there are a lot of great posts out there in the geoblogosphere that i d like to catch up on too and highly allochthonous has moved to scienceblogs congrats here s a photo from this year of us on one of the more beautiful days i ve experienced down there that s the torres of torres del paine in the background a lot of tourists travel a long way and never see them because they ll be shrouded in clouds for days at a time posted by brianr at 3 22 2007 2 comments labels patagonia thursday march 08 2007 still in the field we are in town right now puerto natales chile to resupply get a shower and sleep in a bed for a night there are a bunch of internet cafes in this town because it is a jumping off point for backpackers and such mostly europeans traveling around patagonia the weather has been the usual either really nice 60s f and sunny or completely miserable 30s f with snow or rain i either feel ridiculous carrying so many articles of clothing in my day pack when its nice or wish i had more to wear when its cruddy probably the most exciting thing to happen so far this year is that i finally saw a puma they are essentially the same species as a mountain lion in north america but a bit bigger i think they are around and probably see us all the time but are timid and difficult to actually see today we saw one cross the dirt road we were driving i was happy to be in the car the thing was big and muscular it could kill and eat me without much trouble if it wanted to luckily they are fairly well fed in this region plenty of sheep and guanacos and turistas posted by brianr at 3 08 2007 1 comments labels patagonia newer posts older posts home subscribe to posts atom please read 8 28 07 or something is called clastic detritus and can be found at http clasticdetritus com the new feed is http clasticdetritus com feed please update your feeds and blogrolls comments have been closed down please go to new blog thanks what is this blog all about check out these posts to get an idea theoretical stratigraphy part i transfer of sediment across continental margins sediment accumulation rates and measurement bias conglomeratic intrusions geology geopolitics and the law of the sea geologic field work in patagonia photos of sedimentary structures life as a graduate student in science review of film end of suburbia earth science blogs all of my faults are stress related apparent dip branner blog geology com green gabbro growth faults highly allochthonous lounge of the lab lemming migeo geología sig y más olelog ontario geofish ripples in sand ron schott s geo blog sabine s garden sismordia slightly diktytaxitic southern exposure terra que gira climate science blogs realclimate open mind climate audit the intersection rabbett run atmoz head in a cloud other science blogs deep sea news the anterior commissure laelaps three toed sloth sum 1 to n academic productivity sciencebase scienceblogs science news science daily earth climate bbc science and nature eurekalert earth science nature and science news nova science in the news sciencenow other science links united states geological survery usgs earth portal american association for the advancement of science aaas intergovernmental panel on climate change ipcc sf bay area and california geology links recent california earthquakes cascades volcano observatory mars exploration rover mission on the origin of species e book 15 answers to creationist nonsense exploratorium science museum in sf general links new york times bbc news cnn news wikipedia san francisco 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