1. Hover over either the U.S. or World categories, to view the drop-down menu.
2. Choose the Science section from the menu (this image shows the U.S. category).
Then choose the Trilobites section from the bar under the Science section heading.
You can run simple searches on the NYT site, and the results update as you type your search. Use the search bar just under the "Trilobites" section heading, not the search bar at the very top of the page (the one at the top will search the whole NYT site).
You can search terms that are likely to indicate primary literature, like "study", "research", or "report".