I must have been about 10 years old when we spent the holidays in Bergen near the North Sea (Netherlands). One night my father woke me up: “Get up! Put your shoes on, we’ll go to the beach!” “Why?” did I ask, still very asleep. “We are going to watch the light of the sea!”
It had been hot and windless all week. Ideal conditions to see sparkling sea turning the beach into a magical place. The waves radiated a blue light. As you moved through the water, blue light rippled around you. And as you walked over the wet sand, a trail of glowing footsteps slowly died out behind you. Zeevonk, it’s called in Dutch
The light comes from the alga Noctiluca scintillans, which emits a bluish light when moved. Earlier I told about the herrings in my fridge that gave light – probably also caused by the ingestion of these algae while swimming (see Luminescence).
All these years I hoped to one day see that light of the sea again. And last week I did. Not as exuberant as I remember; actually I would have walked right past it if another visitor hadn’t pointed out the puddle that the low tide had left on the beach. But I was just in time, for that night was the last that the phenomenon could be observed. So I am more than happy now, with some fresh memories.
A special place in the Algarve is Salema Beach, Praia da Salema, near Vila do Bispo. There you can find well preserved dinosaur footprints right at the beach. As you can see, the toes are round and without claws, which indicates that these are the prints of a herbivore, an Ornithopod, a bit like an Iguanodon.
It is estimated that these prints are roughly 130 million years old, dating from the Early Cretaceous. Standing in these footprints of dragons long ago spurred my imagination with fantasies of time machines and walking between those animals in another era.
Let me show you one of the magnificent beaches in the Algarve! Lovely to spend some time here, in between the chase for dinosaur prints at Salema.
Incredible to witness these dinosaur tracks and imagine how some 130 million millions years ago, huge lizards roamed this place. Salema Beach has more footprints, but they are well hidden. You´ll probably need a local guide to help you out, for even if you are standing close to these vertical rock formations the prints are difficult to see. António Alfarroba pointed them out. As you can see this one does have claws, so it must have been hunting for prey here. I´m afraid I haven´t been able to find out the exact species – if you do know it, you’re welcome to mention it.
Going back down memory lane. Huge flocks of pictures are quietly scratching my hard drive. It’s time set some of them free and let them fly out into the wide wild world. Starting with the Algarve, Portugal.
First one above is the lighthouse at Sagres. Suddenly you’re in an Old Testament scene. A goat herd walking home after sunset in Vila do Bispo
Sunset at sea through a deserted customs building in Vila do Bispo
Sunset ´on the rocks´ near Atlantic ocean in Algarve, Portugal
Algarve beach in twilight after sunset
Same coast from a different point of view and way, way after sunset