Jian‐xin Zhao

Subdued surface expression of deep cave collapse

Cave systems can be difficult to recognise where karst landforms are subdued or overprinted with other landscape processes. Subtle linear depressions on carbonate platforms are commonly interpreted as fluvial or tectonic landforms, but may also mark collapse above underlying cave...

Fossil denticles reveal how ocean productivity shapes shark baselines and recovery potential

Shark populations on coral reefs have declined globally, but few baselines exist to quantify natural variability before human impact. Using fossil dermal denticles preserved in reef sediments, we reconstructed shark communities across the Isthmus of Panama before substantial expl...