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Geology of Skiing #2: Gros Morne National Park, Newfoundland

Last year was a pretty amazing ski year in the northeastern United States - abundant and high quality snow continued well into March for some wonderful spring skiing (which I missed out on since I was in Chile). However winter 2011-2012 in the northeast has so far failed to produce more than a sprinkling of snow, which is why I headed north to Newfoundland with my friends Bruce and Nate in search of natural snow in excess of 3 inches. The journey itself is a story; we left Castleton, Vermont at approximately 2:30AM EST and drove north through New Hampshire and Maine, crossing the border into Canada into St Stephen, New Brunswick. We followed Routes 1 and 2 across New Brunswick and north on Routes 104 and 105 to our final destination, North Sydney, Nova Scotia. Approximately 17 hours after leaving Vermont we boarded a Marine Atlantic ferry at 10:30PM AST for a overnight crossing of the Gulf of St Lawrence and made port in Port aux Basques at approximately 7:00AM NST. We followed Route 1 north through Corner Brook, past Marble Mountain Ski Resort, and turned west onto Route 430, arriving at our ultimate destination and base camp: Rocky Harbor. The entire travel time was approximately 30 hours and well worth the effort.

Much to our dismay Newfoundland was experiencing the same warm winter as Vermont... we arrived to barely freezing temperatures and little snow cover on any feature lower than ~1500 feet - even the higher elevations presented thin cover. We spent the first of four nights at Gros Morne Cabins listening to howling wind in excess of 40mph. The wind hadn't abated by morning and looking out into the dark choppy waters of Rocky Harbor cove, it was clear we weren't going to go skiing. We were inspired by a panorama photograph in the convenience store to hike into Western Brook Pond - a small, shallow pond filling an uplifted fjord to the northeast of Rocky Harbor. The Hiking into the pond the temperature dropped, winds increased and frozen precipitation in the form of sleet pellets began to 'fall' sideways. A good sign that skiing was in our future. The northwestern shore of Western Brook Pond was littered with small, think platters of ice and eventually we had to turn back when we discovered there was active Moose hunting in the area in the vicinity of Snug Harbor.



Western Brook Pond 2 
Looking east into Western Brook Pond canyon

From Western Brook we headed north to Cow Head, which is a small island connected to the mainland by a tombolo created by a classic cuspate spit well-armored in places with clasts of varying lithology. Cow Head itself exposes limestone conglomerates, shales and limestone of varying thickness that have been weathered and eroded into steep cliffs and long fins that run parallel with the currents. Instead of hiking for snow we found ourselves enjoying an afternoon of 'extreme tide pooling' in blistering wind carrying shards of ice.


Ice at Cow Head Cliffs 
Looking north along the western edge of Cow Head

Our second and third days were more successful. The wind calmed down, the temperatures dropped and we could see snow accumulating in the higher elevations. We ventured south towards the Tablelands - a large plateau sheared off by glaciers composed of serpentinized peridotite.


Woody Point Panorama 
A view looking south across the South Arm of Bonne bay into the Tableands from Woody Point


Dunite with Serpentinite Weathering 
An example of serpentinized peridotite exposed in the slope

Peridotite is an ultramafic rock derived from the mantle; part of a thin slice of oceanic crust exposed at the earth's surface as part of an Ordovician ophiolite complex. We turned into the first parking lot on the south side of Route 431 just past Winter House Brook and picked our way through a sea of exposed peridotite into an unnamed cirque between Dry Brook and Winter House Brook.

Image from: Osborn et al (2007)

The first day we skinned up and only skied the lower portion of the bowl because of poor visibility and evidence of recent avalanche activity. The second day we skinned up onto the Tableland plateau itself and skied the upper bowl. We took three runs down a moderately steep gully (Osborn et al. described the gullies as fluvial gorges) filled with knee deep powder and returned to the parking lot via a rock slide channel filled with wind-blown snow. The Tablelands area is littered with solifluction lobes, rock slide channels, sporadic rock-glacier debris, patterned ground, and weakly developed moraines. More than anything else, these features are the reason I would like to return in the summer to hike and explore these unique u-shaped valleys exposing serpentine barrens.




Unamed cirque near Winter House Brook 
Small panorama looking southeast towards the Tablelands taken from the parking area

I highly recommend a visit to Gros Morne National Park any time of year (even though I haven't yet visited in the summer, it can only be more magnificent). The landscape is breathtaking and the geology is incredibly diverse, ranging from calcareous turbidites near Cow Head, to Grenville age gneisses surrounding Western Brook Pond and the Long Range Mountains, to the volcanics of Green Gardens and peridotite making up the Tablelands. Truly a unique geologic and skiing excursion!


 
Complete slideshow of photos taken during the Newfoundland trip

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Accretionary Wedge #41 - Memorable Conduit of Oozing Lava

Ron Schott's topic for this installation of The Accretionary Wedge prompted me to get back on the blog wagon. He asked us to ponder the most memorable/significant geologic we've directly experienced and I instantly though of watching lava drip into the Pacific Ocean and turn into pumice while precariously perched on a lava bench in Hawaii. Which by the way, was one of the silliest decisions I've ever made while 'chasing' geology. However it was one of the most memorable thus far (watching Stromboli erupt at sunset is a close second, I'll share that story in a future post).


It may be the 'go to' for a lot of responses to Ron's request but watching lava flow out of a small vent, spill over onto a lava bench, disappear into yet another tube and then slowly dribble out into the ocean was awesome. Awesome in the strict definition of that word. I was both mesmerized by the visual and awestruck at how quiet the process of building new land was; the gulls made more noise!

I climbed down a steep, gnarly, crumbly and rotten slope of basalt with one thought in my mind: "pumice, pumice, pumice..." I knew it was forming, the white vapor clouds told the tale of superheated lava encountering seawater but I wasn't sure I would be able to see it actually 'drip' into the water. I was worried it would be below the water level... I should have been worried climbing back up a life threatening slope of manky basalt waiting to slice and dice, but I wasn't. I made it all the way to a postage stamps sized black sand beach (ok, slightly larger than a postage stamp) and waited. I couldn't see anything at first because the steam was blowing towards me (problematic for a number of reasons, least of all obstructed viewing opportunities) but eventually the wind shifted and there it was: the maple syrup of geology, slowly oozing out of a wave battered lava bench (again, take note of throwing caution to the wind), stretching out to touch the water and then sizzle and steam and then... float. It happened just liked I'd been told, read and watched in videos. It was aa'aa-mazing. <-- I know, I know... please forgive the lack of scientific correctness and enjoy the few photos I was able to take that more or less captured the 'event.'


Returning up the slope of death was uneventful (for me) and truth be told, I would do it again. Not one of the best decisions I've ever made and in hindsight I would do several things differently but it was an amazing event, one few folks likely take the risk to experience (which just means they make better decisions than I do).

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Chinchorro Cemetary - Gigapan

This is a Gigapixel image I took of an exposed Chinchorro cemetery on a steep north-facing slope of the Morro, which overlooks the northern city of Arica. My friend and colleague, Bernardo Arriaza, asked me to take this photo to help protect this area from development. This is just one of many cemeteries still waiting to be excavated on the Morro. Apparently the problem is less about funding the excavation as it is having storage for the excavated material.


Standing in this location and looking north out over the city, it is easy to see why this site would have been chosen for a burial and occupation site. The steep slopes provide a strategic defensive position and the views are unparallelled in the area - at least when looking northwest to northeast. They also had easy access to the ocean and rivers, for food, water and wetlands filled with the all important reeds they used for mats, windbreaks, and wrapping their dead prior to burial.


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Geologic Mapping on the iPad - For real?

I've spent a lot of time over the last year downloading and playing with applications for the iPad that have some relevance to geology. However the dream of using a lightweight tablet with a stylus and built-in GPS for field mapping is getting closer to reality. I always thought the limiting factor was the ability to make use of digitizing on the tablet to draw contacts, annotations, etc. However, I think the free iCMTGPS app provides a viable tool for actual field-mapping. It isn't as slick and easy as using ArcPad, however it works and it's as accurate as many of the GPS units are folks are using for 1:24,000 mapping.

You can email the support staff at CMT for a user guide, but it's a little thin on some of the specifics so I put together a short review and tutorial illustrating how it can be set up for field mapping applications. Strengths, weaknesses and quirks are all discussed in the video. Any and all feedback is appreciated!

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Accretionary Wedge #35: Favorite Geology Word

For this month's Accretionary Wedge, Evelyn Mervine from Georneys asked us the impossible... to settle on one favorite geology word. I've been mulling this question over off and on for the last week, and found myself sifting through words like yardgang, pingo, sandur, tor, felsenmeer, molasse, tuya, tombolo, doline, nunatuk, moulin, firnschnee, thalweg, polje, inselberg, tafoni, etc... probably a lot more I can't remember right now. Clearly I like words that are unique and often derived from another language, I'm especially partial to German-based terms. Hopefully I'll get around to blogging about each of these words and sharing my photos of them, although I don't have a good photo of a polje. Guess I need to take a trip to Eastern Europe!

However one word that has always fascinated me and drawn me to its country of origin is
jökulhlaup. A term derived from the Icleandic for glacier ( jökull) and burst or flood (hlaup), which we use to describe a glacially-derived outburst flood. They are often triggered by a tuya - also in my list - which is a subglacial volcanic eruption. These two events are excellent reasons why Iceland is called the land of 'fire and ice.' Here are two videos that illustrate this process in action following the eruption of Eyjafjallajökull in 2010.






I didn't become really fascinated with jökulhlaups until after I had read about the Wegner-esque experience of J. Harlen Bretz. Faced by similar dogmatic biases from the geologic community, Bretz challenged the status-quo and argued that the scablands of the western United States were created through a catastrophic flood. However, similar to Wegner, he failed to provide a 'smoking gun' that would convince his detractors. The origin of this flood (although, generally accepted as multiple flooding events) was later identified by J.T. Pardee as jökulhlaup events from Glacial Lake Missoula. Two excellent books on this topic are "Glacial Lake Missoula and its Humungous Floods" by David Alt and "Bretz's Flood" by John Soennichsen.

Fortunately for me, I also lack photographs of a jökulhlaup in action but here are a few photos taken while traveling through the scablands in 2000:



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