A massive conglomerate is never just another rock layer. It is a bookmark in Earth's autobiography.
The Portofino Conglomerate at Punta Chiappa: what the park sign does not tell you, what the 2023 paper gets right, and where the open questions still live. I stood at Punta Chiappa on the Ligurian coast near Camogli and felt, almost immediately, that something was wrong. Not wrong in the sense of a mistake. Wrong in the sense of out of place. The rock in front of me, 600 metres of massive, poorly bedded conglomerate sitting on a scenic headland, did not fit the landscape around it. The hills behind it are sandstone. The sea is in front. There is no river. There is no obvious feeder. The clasts are rounded, which means something transported them, but to where, from where, and by what mechanism? I read the park sign. Fan delta , it said. Eocene. Source from the north. Then I looked at the rock again, and the questions kept coming. Figure 1. Tectonic map of the central Mediterrane...
