The picture on the left is the lahar being eroded by the river with the volcano in the background. The image on the right is a picture of the bottom of trees that were buried by the lahar and date to about 1000 years ago.
The rim of the caldera appears to be breached by a lahar. Ground truth verifies that it is a lahar and their are "islands" of what appear to be parts of the caldera in the lahar.
Description
The Volcán Barú (also Volcán de Chiriquí[1]) is an active stratovolcano and the tallest mountain in Panama, at 3,475 metres (11,401 ft) high. It lies about 35 km off the border of Costa Rica.