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New Miocene Fossil Find in Australia

Fossil Fern

A spectacular new fossil trove has been reported in New South Wales, Australia. Located in the Central Tablelands regions, about 25 miles from the 19th century gold rush town of Gulgong, and named McGraths Flat after the person who discovered the fossil cache, the site is a window into the wetter and forest dominated past of Australia.

The fossil cache includes thousands of beautifully preserved specimens of flowering plants, ferns, spiders, insects and fish dating to the Miocene (23.03 to 5.33 million years ago) era. Climactic upheaval during the Miocene dried the rainforests that once covered Australia. At the time of the fossil cache’s formation the rainforest that had once covered the site had changed into temperate forest around a small lake. A fine goethite (an iron hydroxide mineral) matrix acted to help preserve plants and insects in the water. A diverse array of flowers, ferns, arachnids, insects and other soft bodied animals have been found in the fossil cache.

Image is illustrative of fossilized fern Dennstaedtia americana. Image by James St. John – https://www.flickr.com/photos/[email protected]/39373225554/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=97215903

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Short Crystal: Quartz and the Fossilized Bird

Photograph of the holotype of Zhouornis hani, a type of Enantiornithes

A recent study in Frontiers in Earth Science reveals that researchers discovered quartz crystals in the stomach of a bird that lived alongside the dinosaurs. The bird, a member of the Enantiornithes clade of fossil birds, appeared to be a sensational discovery, as previously there had never been a find which preserved any traces of food in the fossils stomach which would clue researchers in to the diet of the animal. Many modern birds have what’s called a gizzard, a thick and muscular portion of the stomach used to help digest food. Often birds swallow small stones know as gizzard stones, which make their way to the gizzard itself where it helps to crush tough or difficult to digest food. These stones are know as gastroliths and have been found in some dino and bird fossils providing hints as to the diet of those animals. The presense of stones in the stomach, though isn’t defiinitive as to the purpose of the stones. There are some modern birtds of prey that swallow rocks to help move material through their digestive tract, cleaning it out, and it’s hard to differentiate between a gastrolith and a gastrolith that is a gizzard stone without knowing anything about the diet and habits of the animal using the stone. In the end, the reesearchers determined that the quart material found where the birds stomach would have been probably was a gastrolight at all. After exposing the supposed gastroliths to X-rays and a scanning electron microscope it was determined that the rocks were actually chalcedony crystals, quartz that grew in sedimentary rocks. There is evidence of chalcedony crystals forming with a clamshell, or replacing minerals in fossil bones. Furthermore, the crystals in this case were all connected in a thin sheet rather than separate rocks. The rocks were also much larger than would be expected of rocks swallowed by a bird that size. In the end there just wasn’t enough evidence, and some negative evidence against the idea that the rocks were in the birds stomach. Just goes to show, never count your gastroliths before they’s been swallowed.

We don’t have any examples of Enantiornithes, but you can check our our collection of fossils for sale here.

Top image is a photograph of the holotype of Zhouornis hani, a type of Enantiornithes,
By Yuguang Zhang, Jingmai O’Connor, Liu Di, Meng Qingjin, Trond Sigurdsen, Luis M. Chiappe​ – https://peerj.com/articles/407/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=33060650