English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Summit Island Formation (new) in southwestern Alaska consists of nonmarine strata that were previously included in the Gemuk Group and in an unnamed unit thought to include strata of Cretaceous and early Tertiary age. The Summit Island Formation consists of thick-bedded conglomerate, sandstone, siltstone, and carbonaceous mudstone in which there is much carbonized plant material and a few thin coal seams. No complete section is exposed; the base and the thickest known section, about 850 m, are exposed in the sea cliffs on the northwest end of Summit Island. The top and about 160 m of section are exposed on the mainland northeast of Summit Island. The beds are gently folded and cut by several faults. The formation apparently rests with angular unconformity on highly deformed older Mesozoic rocks and is unconformably overlain by Tertiary volcanic rocks. Palynomorphs, fossil leaves, and the radiometric age of a dike that cuts the Summit Island Formation indicate a Late Cretaceous, probably Maestrichtian, age.

Summit Island Formation, a new Upper Cretaceous formation in southwestern Alaska