[X] My Assistant

[SFJCody]

I visited a place with beds similar to the Meridiani outcrop last year. Rich in jarosite and shot through with tabular crystals.

I don't have any webspace right now though. If anyone is willing to host an image of mine showing this place I will be semi- eternally grateful :-)

[djellison]

You can add images as attachments to posts in the forum

Doug

[SFJCody]

I can? Excellent... but I don't see a browse button:

'If the admin has enabled it, you will also see a file attachments option, this will allow you to attach a file to be uploaded when making a post. Click the browse button to select a file from your computer to be uploaded. If you upload an image file, it may be shown in the content of the post, all other file types will be linked to.'

Oh, and the image is a 412kB JPG

[djellison]

Under the emoticons on a new post? I'll check the admin settings for it - but I'm fairly sure I had it turned on specifically for the purpose of people showing pictures

Infact - just checked the settings - upload is set to on for all members in all groups.

Doug

[SFJCody]

No... under the emoticons I see 'Add reply' and 'preview post'

[lars_J]

Hmm, I don't see any way of attaching images...

[djellison]

You dont get


?

Thats most odd - because it is turned on in the forum, I'll go do some googling on it

Doug

[SFJCody]

I don't get 'file attachments' or 'options'

[lars_J]

Nope, I see neither the "file attachements" nor the "Options" section.

[SickNick]

Glad it's not just me. I couldn't find it either.

Gave up weeks ago and link stuff in from another site I *can* post pictures to.

Is it Browser-specific? I use Mozilla (1.3.1)

[djellison]

I'm on Firefox - so it's not the browser.

I'll chase it up tomorrow.

Doug

[djellison]

Hee hee - I am SUCH a spaz

You we all set to be able to upload images, that bit was fine

Just the maximum attachment size was - ahem - zero kb

Changed it to 2 meg - but try and keep it at a reasonable size. If I see a sky-rocket of bandwidth because people are using here as a file dump to post links to on other forums etc, then I'll turn on the old registered members only visibility

Doug

[SFJCody]

Let's see if this works...

Attached thumbnail(s)

 

[Gray]

Very interesting exposure. What do you know about the depositional environment of sediments? Is the jarosite a surficial weathering deposit? It didn't seem as obvious in the images where you had scraped beneath the surface.

[SFJCody]

It's fairly insubstantial- I guess it's surficial.
I don't know much about the circumstances surrounding the deposition of the jarosite bed.

From a website with a scrap of information about an exposure of the Wealden jarosite that appears a few dozen miles away:

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"Oxidation of the iron sulphide pyrite can produce sulphuric acid and iron oxides. Reactions lead to the formation of the hydrated iron-bearing sulphate jarosite (with either sodium, potassium or ammonium). This yellow surface encrustation is often mistakenly referred to in old literature as " sulphur ". It is slowly soluble in water and is washed away to some extent by heavy rain but develops again in fairly dry weather. "
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The exposure in my photos was only revealed in the past couple of years. The cliffs in the area are prone to slumping and subsidence in the winter and sometimes large areas are inaccessible.

Below the orange jarosite crust the material is two thin beds of grey clay with bright yellow patches (best seen in photo 3) separated by 20cm of lignite (the blackish stuff in photo 1). The gypsum cystals are occur in both beds in both the yellow and grey areas. I found a lot of them stuck to the underside of the lignite.