Some pictures from our 2009 trip to Gibraltar - with "A Field Guide to the Geology of Gibraltar" by E P F Rose and M S Rosenbaum in my hand - not a comprehensive review of the local geology, just a look at the areas we visited

Seen from Spain, looking towards South West Bob for scale
The "Pillars of Hercules" - the Atlas Mountains and the Rock of Gibraltar Walking up Engineer Road - large areas concreted over for fire breaks
On walk up the Mediterranean Steps One cave was being used for a comfort break by military personnel climbing the Steps
Most of the Rock is the Jurassic Gibraltar Limestone Formation - here with blue pimpernel for scale; there is a rich profusion of plants on the Upper Rock Caves on the Mediterranean Steps - there are numerous natural caves in the limestone - solution cavities, "sea caves" at former sea levels and man made tunnels (mainly by Royal Engineers)
Our hotel is along there somewhere - opposite the beach The hard climb worth the views
Looking north across the former water catchments, with Catalan Bay just apparent on the right, and the coast line going into Spain.  Scree breccia evident above Catalan Bay At top of steps - O'Hara's Battery - dip of bedding evident.  The Main Ridge is overturned limestone, probably caused when the collision of the African and Eurasian plates pushed the Alboran microplate upwards and westwards
Pen just visible in the crack for scale - approx 15 cm long Stromatolites and other fossils all along this stretch of the road
Walking down from O'Hara's Battery - rocks along the road side Just below St Michael's Cave - the tour bus driver's "Fossil bones"
Zoomed in from Upper Rock Line of holes in the Rock show where guns were placed in seige tunnels
View across to the "Europa Pass" - now home to the Glen Rocky Distillery North Face seen from Spain - scree breccia evident right of centre; (Quaternary) isthmus sands providing a base for the airfield
White van at foot of picture for scale Spent some time looking for the Little Bay shales - not sure if I found them?
Little Bay - outfall from the water desalination plant - folding in rocks to right of waterfall - looking north eastwards Zoomed in to the rocks on the far (south) side of Little Bay - couldn't get near it to have a proper look
Bob for scale, complete with orange bag Field of view probably approx 5 metres high
Northern entrance to the Keightley Way Tunnel (General Keightley was the Governor for the first couple of years I lived in Gib) Southern end of the Tunnel - eastern side wall
To the west of the man made wall, middle of Windmill Hill cliffs Windmill Hill cliffs, looking north from Europa Point
Windmill Hill cliffs, seen from Europa Point (looking north) - folding evident behind the mosque Further west from the previous photo - change in direction of bedding.  This section of Gibraltar "right way up".  Windmill Hill and Europa Flats are evidence of previous sea levels - wave cut platforms probably raised by tectonic uplift.
Looking south - field of view approx 20 metres Just beyond Eastern Beach
North Face - coloration on rock face Northern entrance to William's Way - when we lived in Gib, this was the only way to get through to Catalan Bay
This is where the tunnel comes out at Catalan Bay Fault to left of centre of picture
Southern entrance to William's Way - the tunnel curves round through the rock - currently it is closed to the public This southern entrance to William's Way is cut through the youngest Mesozoic rocks on Gibraltar, the Catalan Bay Shale Formation - which underlies the overturned Gibraltar Limestone
Sands quarried for building purposes Large scale structures - field of view - dunes approx 5 metres high
Catalan sands - windblown desert deposits above Caleta Palace Hotel More sedimentary structures in the Catalan sands
Looking down from Upper Rock The grey looked like stromatolites
Looking across the Straits of Gibraltar - waves coming into the Mediterranean from the Atlantic Interesting rock features just above Jew's Gate - pencil for scale - 15 cm
Pencil for scale Interesting layers - need more time to investigate!
Layered infill - coarsening downwards Queen's Road - Bob's hand for scale
Pencil for scale There's that pencil again, at the bottom of the blast channel
Stromatolites and peloids - Queen's Road Evidence of engineering work to make the roads - blasting in the rocks
Pencil again Still on the Queen's Road, and haven't managed to lose the pencil yet
Some rocks had quartz veins within them - this had a layer of quartz on the surface This was an exciting little exposure- quartz crystals like white and demerara sugar :-)

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