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Showing results for tags 'jiufotang formation'.
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Oxytropidoceras posted a topic in Fossil NewsThis Bird 'Eyeball' Survived 120 Million Years By Laura Geggel, Live Science, January 11, 2018 https://www.livescience.com/61405-dinosaur-age-birds-saw-in-color.html An Amazing Fossilized Eye Reveals How an Ancient Bird Saw Feast your eyes on this. By Natasha Frost, January 12, 2018 https://www.atlasobscura.com/articles/amazing-fossilized-ancient-bird-eye-color-rods-cones The paper is: Tanaka, G., Zhou, B., Zhang, Y., Siveter, D.J. and Parker, A.R., 2017. Rods and cones in an enantiornithine bird eye from the Early Cretaceous Jehol Biota. Heliyon, 3(12), p.e00479. http://www.heliyon.com/article/e00479/ Yours, Paul H.
A very technical paper but what what I found interesting is the process to obtain evidence of color vision among extinct birds . An exceptionally well-preserved extinct enantiornithine fossil bird from the Early Cretaceous Jiufotang Formation (120 Ma) of Liaoning, China, provided the first report of mineralized soft tissue of a bird eye. Cone cells are identified, which have preserved oil droplets that can be compared with an extant house sparrow. The size distribution of oil droplets of extant birds demonstrates good correlation between size and the detectable wavelength range of the cone cells: UV-sensitive cones contain the smallest oil droplets, while red-sensitive cones possess the largest. The data suggests that this Early Cretaceous bird could have possessed color vision. It's amazing what technology can do today. http://www.sciencedirect.com/science/article/pii/S2405844017308587
I have a coprolite from Sihedang Town, Chaoyang City, Liaoning Province, China. The preparation was bad, and the coprolite itself came free of the matrix during shipping. Since it was a good sacrificial piece, I decided to dig around. I found this tooth, but unfortunately, I broke it before I was able to extract it or get a microscopic image. Any guesses? The coprolite contains no scales, but there are fish bones and vertebrae partially exposed. Thanks in advance for any help you can offer.