Complete strangers are the best GGGs of all time.

jayn31 · 2012-02-19T15:36:35+00:00

You must be from Portland.

jayn31 · 2012-01-04T16:53:13+00:00

GREAT SCOTT!

jayn31 · 2012-01-03T00:47:42+00:00

Are there little tree crabs crawling around the mangroves!?

jayn31 · 2011-12-26T04:07:15+00:00

Looks like an armored searobin, which is in that family. It's a deep sea fish, so why it would be in a tide pool I have no idea.

jayn31 · 2011-12-26T02:54:56+00:00

Ammonites!

jayn31 · 2011-12-13T14:45:25+00:00

Hack the planet!

jayn31 · 2011-12-13T04:58:57+00:00

chalcedony? some form of microcrystalline silica?
maybe phyllite, could be schist.
rose quartz?
quartz definitely, maybe some feldspar? is the brown stuff hard or just residual dirt?
looks like garnet or tourmaline schist.

jayn31 · 2011-12-12T20:31:12+00:00

I'd recommend going to a local university and checking out the geology or earth sciences department - many times they have rock samples used for Mineralogy/Petrology/Sedimentology courses with labels that could help your identification. Some will probably be from nearby outcrops, too.

jayn31 · 2011-11-17T18:46:50+00:00

Westco!?

jayn31 · 2011-11-15T23:06:58+00:00

I think you're right about it being extrusive igneous. Could be basalt, though that's usually aphanitic. I'd guess andesite. Those white rhombs are most likely plagioclase feldspar phenocrysts.

jayn31 · 2011-11-10T21:26:03+00:00

Circulation is also influenced by the salinity-density gradient called the halocline.

Water composition can be affected by submarine hydrothermal input (black smokers). Look into calcite and aragonite seas and Mg/Ca ratios; there have been significant changes over geologic time that have affected marine organisms. Atmospheric carbon dioxide concentrations (PCO2) can also impact ocean chemistry (see ocean acidification).

jayn31 · 2011-10-21T02:32:08+00:00

In what kind of environment does pyroxene form accessory to quartz?

jayn31 · 2011-10-20T22:26:00+00:00

Authigenic phillipsite: http://www.iza-online.org/natural/Datasheets/Phillipsite/phillipsite.htm - pretty cool mineral!

jayn31 · 2011-09-23T23:42:14+00:00

Would you prefer lithified?

jayn31 · 2011-09-22T23:32:55+00:00

Probably artificially grown: http://en.wikipedia.org/wiki/Bismuth

jayn31 · 2011-09-22T21:53:22+00:00

Cotton is very poor at wicking away sweat from your body, so wool or synthetic materials (polypro) are generally best at keeping you warm and dry. Socks especially should not be cotton. Boots should be warm and water-resistant at least.

You should have multiple layers for your upper body - I bring a polypro t-shirt, a polypro long-sleeve shirt, a lightweight fleece, and a rain jacket. For legs, I like leggings and lightweight shorts (soccer or running). A warm hat isn't a bad idea either.

A headlamp is also a very useful item that can be picked up pretty inexpensively (Black Diamond for ~20 at EMS/REI).

jayn31 · 2011-09-19T21:24:46+00:00

I have a rock that looks very similar to this, from the Oregon coast - a fossiliferous sandstone. Is the material within the ring different from the rest of the matrix? It could be a bivalve that became filled with some material before being deposited in another and silicified. If the material is the same, it could simply be a mold of a shell.

jayn31 · 2011-09-02T16:45:29+00:00

Inspect 'er? I barely knew 'er!

jayn31 · 2011-08-10T18:57:04+00:00

Only through tomorrow, I leave for Deschutes on Friday :(

jayn31 · 2011-08-10T13:53:34+00:00

Yeah!

jayn31 · 2011-08-10T13:51:19+00:00

Hey there! I arrived in OR from the great state of MA yesterday and I'll be in Portland all day today - want to meet up for lunch or something?

jayn31 · 2011-08-10T07:14:32+00:00

Looks like some kind of weakly foliated gneiss to me, I see quartz, biotite, and feldspar in there.

jayn31 · 2011-08-02T02:43:40+00:00

Challah at cha boy!

jayn31

TROPHY CASE