One last map request

Note: this blog won't die... monthly hits almost 20K mid-April! Seen on desktop here, that also lists top reads.

When visiting the nearby village of Pontacq (Flickr & village site), the glorious sunshine showed the Pic do Midi de Bigorre (Wikipedia) so clearly we could see the observatory atop! It's the left peak in the central massif below.

click to enlarge, view SW from nr. Pontacq

So what might be the geology that created the layers clearly outlined in the melting snow? It so happened I already has French geological survey's 1:1M map already on my computer, so I created a 3D view lookig neast along strike - along the ridges - underlain by the geology. You see the layer ribbons following the ridges in this perspective view:

click to enalrge, full size here

This effect comes from using so-called overlay blending: it allows the topography to peek thru the geology - natural as the former is created by the latter - already used it in this story map here and recent blog here to show relief and infrastructure in N England.