If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)

Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.

Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Unusual erosive forces?

slowburner · 2016-06-09 10:28:53

This stone exhibits signs of quite unusual (?) erosive processes, believed to be formed by freeze/thaw action. This type of fracturing is commonly known in the UK as 'pot lids'. Can anyone offer a description of how exactly these processes operate, and how they came to form this pattern? Not too sure of the precise…

09-06-2016 11:28am

#1

slowburner

Moderators, Science, Health & Environment Moderators Posts: 5,221 Mod ✭✭✭✭

Join Date: May 2009

Posts: 4959

This stone exhibits signs of quite unusual (?) erosive processes, believed to be formed by freeze/thaw action. This type of fracturing is commonly known in the UK as 'pot lids'.
Can anyone offer a description of how exactly these processes operate, and how they came to form this pattern? Not too sure of the precise petrology, but it is probably a fine grained sandstone. The original colour can be seen in the uppermost central 'pot lid'.

1

Comments

#2 13-06-2016 5:02am

Fathom

Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional East Moderators, Regional Midlands Moderators, Regional Midwest Moderators, Regional Abroad Moderators, Regional North Mods, Regional West Moderators, Regional South East Moderators, Regional North East Moderators, Regional North West Moderators, Regional South Moderators Posts: 9,300 CMod ✭✭✭✭

Join Date: January 2015

Posts: 9065

Wild guess. Small rounded depressions. Rain pits. Rain drips on exposed sediment surface. When sediment newly forming. Drying flood plains.

0
#3 18-06-2016 1:46am

Fathom

Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional East Moderators, Regional Midlands Moderators, Regional Midwest Moderators, Regional Abroad Moderators, Regional North Mods, Regional West Moderators, Regional South East Moderators, Regional North East Moderators, Regional North West Moderators, Regional South Moderators Posts: 9,300 CMod ✭✭✭✭

Join Date: January 2015

Posts: 9065

Raindrop marks. Sedimentary structures. Source: Physical Geology. Tulane University.

0