Hey #GeologyMastodon may I get an assist in identifying this rock?! I believe I have hit bedrock about 1 metre down in my #BackyardProject #PoolPond excavation.
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Jorge Stolfireplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
But is it just solid rock, or a bunch of separate pebbles?
Those samples you showed are smooth with rounded edges. They look like they have been tumbled for some time at the bottom of a river or on a beach.
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Jorge Stolfi last edited by
@JorgeStolfi Seems like semi solid sedimentary rock. I can only get the excavator bucket teeth into it and scrape layers of it off.. Definitely not pebbles.It crumbles in kind of light grey rubble.
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Mat Wrightreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris @martin_fff it could still be slag used for foundations, levelling properties
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Mat Wright last edited by
@MatWright @martin_fff certainly possible!
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Mat Wrightreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris @martin_fff I've been trying get archive stuff from the Nanaimo museum and city hall, but it's been a slog - so, our property was one of the original farms, given to rail and mine managers, we still have 3 of the original fruit trees
and I do think there is a shaft, probably ventilation, to a mine at the back end of the garden
does VIU have a Nanaimo archive?
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Mat Wright last edited by
@MatWright I believe they do. You could likely call the Library and ask. (I wouldn't recommend doing that next week though... a little crazy the first week back!
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Mat Wrightreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris hah, no doubt - and will do - funny, I never thought them before as a resource, but of course they should
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@MatWright @chris fyi Nanaimo has an ARCgis Web App https://geoportal.nanaimo.ca/portal/apps/webappviewer/
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Mat Wright last edited by
@MatWright for sure! And who knows what there might be around campus in various history, geology or geography offices! Professors are pack rats!
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@martin_fff @chris Martin - do you need to create an account? no free access
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Mat Wrightreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris we are the only property (I think) within Nanaimo city limits with a working ground water well, use for watering the garden - and for telling bylaw to fuck off when they come around about restrictions
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Mat Wright last edited by
@MatWright lol. rebel!
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@MatWright @chris Well, I see no layers option. I guess that's what they've done. My Local Muni ARCgis never asked for account details. Mineshafts should be somewhere on their ARCgis
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David Mitchell :CApride:replied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
No expertise to share but following curiously… what does it look like when it’s dry?
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to David Mitchell :CApride: last edited by
@DavidM_yeg it is grey (see next reply in thread, just putting it up now). Someone mentioned mudstone or siltstone and I think that makes sense.
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Chris Alemany🇺🇦🇨🇦🇪🇸replied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
Someone suggested mudstone or siltstone. This seems right to me. The more I dig and scrape away at it the less I think it is some sort of old fill. When it is dry in the hole it is grey. There are lots of flecks and shards of carbon-like black stuff. But mostly it is grey, crumbly when knocked around, rock.
Here is this morning's look in the hole.Whatever it is, it is too much for this digger to dig through efficiently.
#GeologyMastodon #BackyardProject #PoolPond #VancouverIsland #PortAlberni #Geology #Rocks -
Chris Alemany🇺🇦🇨🇦🇪🇸replied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
In other news, I have already put just under 8 hours on the machine and only dug one of three holes! I guess I am paying for another 8hrs! #GeologyMastodon #BackyardProject #PoolPond #VancouverIsland #PortAlberni #Geology #Rocks
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Maria-Katriina Lehtinenreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris At an experienced guess, weathered and rubbly siltstone of the Haslam Formation (Upper Cretaceous, Nanaimo Group).
Source: my geological mapping of the Alberni Valley and Beaufort Range, ca. 1991.
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Bob Downiereplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris A good place to start for geology information is an online geology map. Perhaps this one will help? Navigate to your location and touch the locality for a summary. What does it tell you?
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martin_fffreplied to Chris Alemany🇺🇦🇨🇦🇪🇸 last edited by
@chris thought you said you were digging in clay? Looks more like limestone at the bottom.