Anne Black
1/15/2022 4:25:17 PM |
Spectacular pieces of LDG!!! Congratulations, Matthias. |
matthias
1/15/2022 4:24:43 PM |
hi scott. these pieces are not treated at all. regarding ldg all depends on the exposition of a piece to the wind (plus sand)over 26-28 mill. years, blowing between the parallely N-S arrangrd dunes. it's also important to see which part of the piece was embedded in the sand: this part of the surface is usually rough, matted, sometimes like frozen (s. pic 3). the glassy, shining appearance is a result of having been exposed to, and polished by, wind, sand and - of course - time. |
Scott McGregor
1/15/2022 11:20:20 AM |
Matthias, thanks for posting these* not the typical LDG! The surfaces, especially pic 2 seem very fresh and glassy. We*re the samples polished or oiled, or is that how they were found? Most LDG seems to have a more matte surface from weathering |
Bernd Pauli
1/15/2022 9:21:31 AM |
Photos #1 and #4 are extraordinarily interesting! |
| |
|