Computer generated terrain clasification based on HiRISE for area north and south of Columbia hills. Colors mark areas which have the same average grid brightness and the same variance. The colors in themselves have no meaning, they are just used to show the different terrains.

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Both images are at 16 mtr / pixel map aligned.

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Distribution of Iron and Ferric minerals as measured by CRISM (average of all available CRISM data). Colors note area's which have the same quantities of iron and ferric minerals, the colors in themselves are meaningless and only used to show the various area's.

Note more or less the same terrain shows up as in above post from HiRISE data.

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Same map for distribution of mafic minerals (pyroxenes) as measured by CRISM.

Once again note that in this presentation the colors do not show whether there is more or less of a certain mineral, they only show the area's which have the same distribution of measured minerals.

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Distribution of Iron and Ferric minerals in homeplate area at 4 mtr/pixel

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Distribution of mafic minerals (mainly pyroxenes) in the homeplate area, based on raw crism data.

Note as in all above images, colors note only area's which have the same distribution of minerals, they don't say anything about whether there are high of low quantities measured.

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Bonneville crater showing computer terrain qualification based on average grid brightness and variance per grid.

Terrain colors are consistent with overview I posted in first message.

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Unnamed crater at aprox 14.752 S and 175.572E showing computer generated terrain classification. Note colors are consistent with earlier messages, difference with Bonneville crater shown above is very clear.

Gusev crater once most likely contained a lake. The main reason for the selection of Gusev as a MER landing site was to look for lake deposits. Does the CRISM data for Gusev crater or for the large overflow channel to the South East of Gusev crater show evidence of lake or river deposits?

A mud flow might be a better description... doesn't seem to be much evidence for actual standing water. I don't know about compositional data (clays etc.) that might add to that.

But - there is an amazing geologic map of the Columbia Hills and Inner Basin area including Home Plate, by Larry Crumpler, in the poster session here at LPSC. I'm drooling - I hope it gets published or distributed as a big PDF at some point. It's a combination of HiRISE data and Spirit's observations.

Phil

If Home Plate is supposed to be a fumarole, could Pitchers Mound be a volcanic cone?