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Smilodon North of the 49th Parallel

The fierce predator Smilodon fatalis — a compact but robust killer that weighed in around...

First Nation Shell Middens And True Oysters

One of the now rare species of oysters in the Pacific Northwest is the Olympia oyster, Ostrea lurida...

Zenaspis: Lower Devonian Bony Fish Of Podolia, Ukraine

A Devonian bony fish mortality plate showing a lower shield of Zenaspis podolica (Lankester, 1869)...

Oil in Water Beauty: Euhoplites of Folkstone

Sheer beauty — a beautiful Euhoplites ammonite from Folkstone, UK. These lovelies have a pleasing...

Heidi Henderson

Musings in Natural History—meant to captivate, educate and inspire.
Palaeontology & Life Sciences—History & Indigenous Culture

Elected Fellow of the Linnean Society... Read More »

Solar Winds: The Magnetosphere

Jul 27 2019 | comment(s)

The Earth has a magnetic field with north and south poles. The magnetic field of the Earth is surrounded by the magnetosphere that keeps most of the particles from the Sun from hitting the Earth.

Nuclear Fusion: Electromagnetic Sunlight

Jul 27 2019 | comment(s)

Have you ever wondered about the colors you see in these moments? What sunlight actually is? Yes, it's light from the Sun but so much more than that. Sunlight is both light and energy. Once it reaches Earth, we call this energy, "insolation," a fancy term for solar radiation. The amount of energy the Sun gives off changes over time in a never ending cycle. Solar flares (hotter) and sunspots (cooler) on the Sun's surface impact the amount of radiation headed to Earth.

Middle Ordovician Trilobite: Hypodicranotus striatulus

Jul 26 2019 | comment(s)

Take a gander at this unusual trilobite, Hypodicranotus striatulus (Walcott, 1875), with his gloriously bulbous head shield.

Cenomanian-Turonian Impact On Marine Reptiles

Jul 26 2019 | comment(s)

During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea. They were particularly abundant in the later Triassic and early Jurassic periods before being replaced as premier aquatic predator by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods.