Geobulletin alpha

News from the Geoblogosphere

New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Blog post recommendation

Portugal's Fisherman's Trail - A 14-Day Hike of Sea and Sand

It seems that just about everyone is going to Portugal these days. Part of the attraction is the generous process for obtaining citizenship there (see this link to learn about the Golden Visa program). And as the USA drifts ever closely toward authoritarianism, a sunny beach-rich and laid back environment looks quite attractive. For me, the attraction was hiking with my wife Helen and two other couples for 14 days along a beautiful and exhilarating coastline. Some people's idea of a vacation may not include a 100-mile walk but it is exactly what we love to do. As an added "attraction", I purposely did not study any of the geology we might encounter while there. - I wanted to be surprised and boy, was I ever!

What's not to like about Latin countries?
There are quaint, seaside villages, great food including locally caught seafood, opportunities learn a foreign languages, and as always, interesting landscapes and friendly people. As Mark Twain wrote in Innocents Abroad, "Travel is fatal to prejudice, bigotry and narrow-mindedness...". How true!
Our course on the Fisherman's Trail took us from Porto Covo in Alentejo to Lagos in the Algarve
The Fisherman's Trail was designated in 2013 and cobbled together from various pre-existing trails into a long, 140 mile coastal route. It is one of the newest of Europe's long hiking routes. An association of interested parties (hotels, villages, and transport service companies has formed called Rota Vicentina. See that web site for great information on how to hike the trail.

Stages of the Fisherman's Trail from Porto Covo to Lagos

Some of the 13 stages were longer than I wanted to do (up to 15 miles a day). I requested a bit more user friendly itinerary's that we could arrive in the villages earlier in the day and experience their charms. It turned out to be a wonderful and enjoyable hike! That's how I answer folks who think walking 100 miles in 14 days cannot be considered a vacation.
The official colors of the trail are green and blue - other nearby trails have other colors
These are the symbols we would follow to stay on course
The owner of Rota Vicentina is Ricardo Estêvão, who came to see us at the start of our trek
We used his company called Vicentina Travel and they were great to work with. They made all of the accommodations, set up the luggage transfer, provided excellent maps of the area and was always available via What'sApp to provide guidance when needed. I highly recommend them. Ricardo also serves on the board of the Rota Vicentina Association.
The beginning - Porto Covo is a lovely, small village of about 1300 residents
The little harbor at Porto Covo and the start of our trek
Note the tanker ship beyond the cliff - 40% of imports come into the country at Sines near Porto Covo
Mist from waves hover above a deserted beach on our way to Milfontes
Ice-plant (Delosperma cooperi) was found on top off the cliffs along the entire route
We did see numerous fishermen using long fishing poles along our trek
On day 3, we took a ferry across the Mira River to save 3 kilometers of walking
Some of the route uses short stretches of backroads, but not for very long
A successful catch!
One thing that should be known - there was sand, lots of sand
This is one of the detractions (to some) about the Fisherman's Trail - sand, lots of sand. As I was to learn later, the top of the plateau is composed of a sheets of marine and eolian sand from the last ice age. The oldest sand has been cemented but younger sands are not. The sand is very coarse and there is a secret that makes walking on sand easier - placing feet directly down and then lifting them directly up. The prevents the feet from "pushing off" of the sand, which causes it to 'avalanche' beneath your feet. It means a shorter stride but we used this technique to great effect.
Older rocks underlie the sand and would soon emerge as the coastal plateau got higher
This is hint of what would emerge from beneath the beaches
Di I mention the sand?
The views were really spectacular!
Here is the sand (yellow and orange) resting on top of Pennsylvanian sedimentary rocks (dark)
As the basement rocks began to appear, I used an app called Rockd to learn what the darker rocks might be (Note: It is not all that detailed outside of the US but if you zoom out it does show crude outcrop extents and the ages of the rocks). The dark rocks were deposited during the Late Carboniferous (Pennsylvanian Period in the USA), about 312 Ma (Mega-annum or millions of years ago). This was a time when Iberia was positioned closer to northern France and just south of the British Isles. See the paleogeographic maps farther down to visualize this.
On occasion, the trail left the coast and through the nearby forest
This view is just north of Cavaleiro - note the upturned sedimentary rocks
The lighthouse at Cabo Sardão near Cavaleiro
Deformed sedimentary strata south of Cavaleiro
These sedimentary rocks were deposited in a narrow seaway about 312 Ma and are known to geologists as flysch. The term was first applied to similar sedimentary sequences in the Alps. Sediment shed of of ancient mountains is deposited in deep water but the sequence eventually fills the marine trough and grades into shallow water sandstone. What you will notice in the photo here is that the layers are at various angles that are bounced by thrust faults. Soon after the flysch was deposited it became caught up in a continental collision associated with the amalgamation of Pangaea.

Paleogeography at the initiation of Pangaea. In the hopper left is the faint outline of North America. Beneath the word Laurussia is Green land and right of that is Scandinavia. The Iberian peninsula is located to the left of the small "b" and at this time, it was attached to Gondwana, the modern-day southern continents. When Gondwana collided with Laurussia, Pangaea was formed. The folds we saw in the rocks are part of a mountain building event called the Variscan (aka as the Hercynian).
Modern-day global map showing the extent of Variscan folds and faults
Sunset over the beach at Zambujeira do Mar
The beach at Zambujeira do Mar
On day 6 we found a few boardwalks to ease the sandy trail
Luggage transfer is a big business now in this part of Portugal
A head cold I likely obtained in Lisbon kept me off the trail for three days - bummer. But my trail companions were able to continue as I recovered for those three days. I traveled with the luggage.
On day 10, we made our approach to the southwestern most point in Europe, Cabo São Vicente
Getting closer to the Cape!
This is the outcrop at Telheiro Beach, just to the north of Cabo São Vicente
Telheiro Beach hosts an iconic angular unconformity and is listed as an international Geoheritage Site by the International Commission on Geoheritage. Check out this link to learn more. And here is another useful link. In the view above, Triassic rocks sit above the Variscan flysch deposits, and a thin cap of Cenozoic marine limestone sits on top of the Triassic rocks. A 3-D model of the unconformity can be viewed here.
Looking south from Telheiro Beach
A fisherman tries his luck near Cabo São Vicente - his partner brought one up while we were here
A screen capture of where we were!
In this view to the east from the Cape, the village of Sagres is visible in the distance
Our group entering Sagres where we enjoy a layover day
A big surprise rot me was how many surfers were in Portugal
Statue to Prince Henry the Navigator
In elementary school, I learned (and remembered) about the exploits of the Portuguese navigators who opened the world to Western Europe. Their navigations were conducted in the 15th and early 16th centuries. The names Prince Henry the Navigator and Vasco da Gama loomed large in my memory on this trip, as they are credited with initiating The Age of Discovery. Use the links above to learn more.
The fort near the point (south of Sagres) is thought to be the seat of the Sagres School
Our layover day in Sagres was wonderful! If you do decide to do this trail, I can highly recommend going slow and arranging for layover days. It is a time to rest up, do laundry and enjoy the surroundings!
Mesolithic monument called Menhir do Padrão between Sagres and Luz
This limestone rock is likely the last standing in this location. It was pointed out to us by a taxi driver. He told me that when he was a boy, the farmers used to knock these down in plowing their fields - no one knew what they were! He said he used to ride his bicycle over them to pop wheelies. Then it became known that these were part of a Mesolithic culture that lived here some 7500 to 6500 years ago. You can read or about this feature, the Menhir do Padrão at this link.
Although a coastal trail with too much elevation gain,
some sections of the trail are steep!
A lone sail boat seems to be adrift in the Atlantic - we had exceptional weather the whole time
Leaving the village of Salema
Looking back at Salema on our way to Luz
Looking east along the trail and the beautiful cliffs
Portugal is land of graffiti and this one on an old fishing plant caught my eye
This part of the trail revealed we were entering a land of expatriates
Entering the lovely village of Burgau
Cretaceous rocks now made up the landscape
In the near distance, I spotted something out of place - back rocks within the shale and limestone. Could it be an intrusive body that was injected into the shale?
Helen had the idea to take a photo of the feet that had carried us over 100 miles!
That's mine in the Chaco sandals. I had heard of the sand along the trail and decided that rather than emptying my shoes of sand every so often, I would just negate that need. It worked out fine as I usually do all of my Grand Canyon river trip hikes in these sandals.
After a lovely night in Luz, we looked back the next day to the west at the village
We ultimately came upon the black rock mass and indeed it was an intrusive plug
We finally made it to Lagos and Ponta da Piedade - Pity Point
The rock formations are wonderful at Ponta da Piedade
One of the many fine beaches in Lagos
Walking to our Hotel in Lagos
Wayne and Helen at the end of the trail in Lagos Portugal
Inspired by the trail!
Thank you for reading this far! Hip, hip hooray to my hiking companions!
Thanks to Joe, Judy, Don, Anne and especially Helen for being such wonderful trail mates! I would travel anywhere in the world with you all! Obrigado.

Stratigraphy.net | Impressum

Ads: