The Kelvingrove Art Gallery and Museum in Glasgow was constructed between 1892 and 1901, showcasing a Spanish Baroque style. It was built primarily using red sandstone, which was sourced from Locharbriggs Quarry in Dumfries, Scotland.
Have a look at the building - the coordinates place you in front of a doorway, look at the blocks obscured by the coloured rectangles:
1) What mineral gives the sandstone it's colour?
2) Describe the lines on the red stone - are they thick or thin, do they all go in the same direction?
3) Describe the lines on the green stone in the same way.
4) Which stone, red or green, displays crossbedding?
5) Please add a photograph of you or identifying item such as your GPS at the location, being careful not to reveal any of the answers to the questions.
If logging as a group, all members of the group must be in the photo - if you don't want to be in the photo, you need to upload your own unique photo showing a personal item or your caching name. The person sending answers must mention in their message the cachers they are sending answers for.
Please submit your answers via message though the Geocaching website or by sending me an email - there is no need to wait for a response before logging your find.
Locharbriggs Sandstone
The sandstone is made up of quartz grains coated with iron oxide and cemented with silica. It also contains some feldspar. The iron oxide gives the sandstone a rich orange or red colour.
Cross Bedding
Cross bedding refers to the distinct layering found within sandstone rocks, characterised by angles relative to the main bedding plane.
This unique layering develops during deposition on inclined surfaces of bedforms like ripples and dunes, indicating the presence of a dynamic medium such as water or wind in the depositional environment.
Graded bedding
A graded bed is defined by a systematic alteration in grain or clast size from the bottom to the top of the bed. Typically, this manifests as normal grading, where coarser sediments reside at the base, transitioning into progressively finer ones toward the top.
These beds typically signify depositional settings where transport energy (flow rate) decreases over time. However, they can also originate during swift depositional events. Their most notable occurrence is in turbidite strata, where they indicate abrupt, vigorous currents that deposit coarse sediments initially, succeeded by finer ones as the current diminishes. Graded beds can also emerge in terrestrial stream deposits.