
Looking northwestward. Here the Var River, that mighty carver of canyons and water gaps, flows over the rapids on the downstream limb of its meander around the fortress town of Entrevaux.
There's so much going on in this frame it's difficult to know where to start. But note how the low-angle winter light warms the locally quarried architectural rock, the Eocene-aged Nummulitique Limestone. I find the masonry of the squat, water's edge tower at center particularly intriguing. It's either coursed ashlar trying to devolve into rubble, or the reverse.
Also of special architectural significance is the high, narrow, single-arch stone bridge. I can attest that a stroll across its span is unforgettable. The river surges below, and town and ridge seem to loom up on all sides.
The Nummulitique Limestone is also exposed on the amazingly vertiginous hogback on the far side of the stream. (To see its full height, take a look at Part 2 of this set.) In view here is the extensive system of terraces of the lower slope. I assume the trees grown there are cultivated Olive, Olea europaea. At least their silvery-green foliage suggests that they are.
As all students of Mediterranean Basin geology know, the Eocene epoch was the heyday of the giant foraminifera of the genus Nummulites. The tests or shells of these single-celled planktonic creatures grew to be as large as nummi—Latin for "coins." Eocene limestones bearing these fascinating fossils have been employed by architects ever since ancient Egyptian times. For an example of an Imperial Roman outpost built of this rock type, see my my Architectural Geology of Tunisia album.
The other photos and descriptions of this series can be found in my Rising from the Earth's Crust album.