Hi, I'm Laia Alegret, I'm a paleontologist and I'm going to show you And I'm going to show you one of the most famous Paleogene boundary outcrops in the world. 00:00:05
We are in Zumaia. 00:00:09
This is in Northern Spain And I'm standing on the Cretaceous rocks. 00:00:15
If you look at the back, you can see the Cretaceous rocks have a dark red color And on the left there is a layer that is almost missing. 00:00:24
It's a very soft level and it's dark grey and that's the KT boundary clay layer.
above that layer. 00:00:37
You have the whole path of the paleogean limestones.
The boundary is right here.
It's that yellow layer you can see and it marks the boundary between the Upper Cretaceous rocks and the Paleogean.
, And we have one of the largest mass extinctions recorded right there at that level.
At the KT boundary.
66 million years ago, this was a deep basin that was formed because of the counter-clockwise movement of the Iberian plate, which collided with the European plate.
So when the European, When the Iberian plate was moving, it created an embayment, And this is where we are.
This is the Iberian embayment and we are in the deeper part of the basin at about 1,000 meters depth.
These sediments were deposited along the slope towards the deeper parts of the basin and they were deposited horizontal.
, Then during the Cretaceous to the Eocian they tilted because of the collision of the two plates, and they are tilted this way today. 00:01:52