Sediments Reveal Their Age

Article Abstract:

A challenging problem for geologists is determining when sedimentary rocks were deposited. The rocks, composed of coarse crystals or rock fragments and found throughout the geological record. Large ion microprobe have been used to measure lead isotopes in microscopic crystals of rare-earth element phosphate mineral. The lead content is a direct chronometer or the diagenetic process. Radioactive decay sequence of elements have been increasingly used since the early 1950s.

Analysis, Measurement, Isotopes, Sediments (Geology), Rocks, Sedimentary, Sedimentary rocks

---

Tropical Paradise at the Cretaceous Poles?

Article Abstract:

The discovery of fossil wood near the northern part of the Antarctic Peninsula prompted many researchers to attempt to redefine an area thought to have polar climates. The plants and fossils found in this region are listed as well as the polar warmth of the Cretaceous period. The results from research conducted in the area are noted.

Natural history, Geology, Stratigraphic, Stratigraphy, Global temperature changes, Antarctic Peninsula

---

Patagonian dinosaurs reveal a cosmopolitan Cretaceous

Article Abstract:

Paleontologists Rodolfo Coria, Leonardo Salgado and Jorge Calvo discovered lineages of northern dinosaurs in South America. The finding provides an opportunity for others to study how continental migration affected dinosaurs' evolution patterns.

Animal migration, Dinosaurs, Patagonia, Paleogeography

Similar abstracts:

• Abstracts: Florida Power & Light copes with Andrew. Micropiles to the rescue. Florida agency issues DBO contract
• Abstracts: Manitoba's whitewater lake is a birder's paradise. A hiker's paradise. The bird-woman of Turtle Lake
• Abstracts: Biodiversity: its meaning and its value. Which came first, the hypha or the yeast? Bioactive substances from insect pathogenic fungi
• Abstracts: The history of synthetic testosterone. The curious history of the first pocket calculator
• Abstracts: Access to and transfer of genetic resources. Technology licensors and licensees: who they are, what resources they employ, and how they feel

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.