>Is that supposed to be some kind of joke. Do you know what
>spheroidal weathering is even?
This is what the original poster actually said "classic examples of spheroidal weathering
and Liesgang rings"... you left out the Liesgang rings. Here is the geological definitions of spheroidal weathering and Liesgang rings:
Liesegang rings Secondary, nested rings or bands caused by rhythmic precipitation within a fluid-saturated rock.
spheroidal weathering A form of chemical weathering in which concentric shells of decayed rock (ranging in diameter from 2 cm to 2 m) are successively loosened and separated from a block of rock by water penetrating the bounding joints or other fractures and attacking the block from all sides. It is similar to the larger-scale exfoliation produced usually by mechanical weathering. Syn: onionskin weathering; concentric weathering; spherical weathering.
Bates, R.L., and Jackson J.A., (1984) Dictionary of Geological Terms:3rd Edition Doubleday New York, 392p
>It does not mean that
>concentric rings will form in the rock as you suggest.
Are there no separations of concentric shells of weathering visible in this photo?
<img src=" [www.viewzone.com];
The variation in colour in this image are Liesegang rings representing alteration minerlization from groundwater.
>simply means that the corners of the rock are attacked first
>because they have the most surface area. Since the corners
>are attacked first the rock will try to get to a sphere shape
>for its entire life. Eventually it will just be another
>small round pebble.
It depends on what stage the weathering is... here is a website that illustrates the process:
<a href="[www.geo.wvu.edu] "> [www.geo.wvu.edu] </a>
The rock in the above "Phoenician Furnaces" photo is still jointed and the erosion morphology is still controlled by that fact. Here for example we see a in Pennsivianian sandstone outcrop, which exhibits spheriodal weathering along joint planes.
An example of spheriodal weathering in granite:
<img src="[www.schweich.com] ">
Do you notice any similarity between this image and the ones provided in the "Phoenician Furnaces" website? If the above images are not spherical weathering then what geological mechanism is creating them... do you have a geologic term for it?
>I would really love to see the picture that you refer to in
>"Modern Physical Geography." I will be looking for a copy of
>it I assure you. The type of concentric shells you refer to
>are an indication of deposition, not erosion.
In spheroidal weathering? I don't think so... Here is the definition of weathering:
weathering: The destructive processes by which rocks are changed on exposure to atmospheric agents at or near the earth's surface, with little or no transport of the loosened or altered material; specifically: the physical disintegration and chemical decomposition of rock that produce an in-situ mantle of waste and prepares sediments for transportation.
I do not see anything in the definition of weathering or spheriodal weathering that indicates it forms directly as a result of deposition.
Archae Solenhofen (firstname.lastname@example.org)