The city’s architecture travels through time and continents, incorporating everything from slabs of the Italian Alps to meteorites that hit southern Africa 2bn years agoIn the heart of London’s Square Mile, between the windows of a tapas restaurant, a 150m-year-old ammonite stares mutely at passersby. The fossil is embedded in a limestone wall on Plantation Lane, sitting alongside the remnants of ancient nautiloids and squid-like belemnites. It’s a mineralised aquarium hiding in plain sight, a snapshot of deep time that few even glance at, a transtemporal space where patatas bravas meet prehistoric cephalopods.How often do you give thought to the stones that make up our towns and cities? To the building blocks, paving slabs and machine-cut masonry that backdrop our lives? If your name’s Dr Ruth Siddall, the answer to that question would be yesterday, today and every day for the foreseeable. Her passion is urban geology, and it turns out that the architecture of central London – in common with many places – is a largely unwitting showcase of Earth science through the ages. Continue reading...