Recent  

The microscopic shells of planktonic foraminifera accumulate on the sea floor over millions of years, providing a rich archive for understanding the history of the oceans. We examined an extinct group that flourished between about 63 and 32 million years ago using scanning electron microscopy and show that they were covered with needle-like spines in life. This has implications for analytical methods that we use to determine past seawater temperature and acidity.

We present a deep systematic and taxonomic revision of the Early Jurassic calcareous nannofossils from the Neuquén Basin. The study focuses on characterizing the assemblages and identifying bioevents. The Pliensbachian associations from the Los Molles Formation are ilustrated for the first time, along with new biostratigraphic data from the area. Similarities found with locaties from the proto-Atlantic region suggest a connection between the Pacific and Tethys oceans during the Early Jurassic.