Catalina Gebhardt

TL;DR: A marine glacial record from the upper 600 m of the AND-1B sediment core recovered from beneath the northwest part of the Ross ice shelf is presented and well-dated, ∼40-kyr cyclic variations in ice-sheet extent linked to cycles in insolation influenced by changes in the Earth’s axial tilt (obliquity) during the Pliocene are demonstrated.

TL;DR: Data from Lake El'gygytgyn, in northeast Arctic Russia, is presented that shows how climate varied between 3.6 and 2.2 million years ago, an important interval in the global cooling trend that accelerated rapidly at the end of the Miocene.

TL;DR: The only known impact structure on Earth with an unequivocal peak ring is Chicxulub as discussed by the authors, but it is buried and only accessible through drilling, and it is not accessible to the public.

TL;DR: Micro- and nannofossil, trace fossil and geochemical evidence from the Chicxulub impact crater demonstrates that proximity to the asteroid impact site did not determine rates of recovery of marine ecosystems after the end-Cretaceous mass extinction.

TL;DR: The presence of IP25 as a proxy for spring sea-ice cover and alkenone-based summer sea-surface temperatures >4 °C that support a seasonal sea- ice cover with an ice-free summer season being predominant during the late Miocene in the central Arctic Ocean is documented.