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Fossil dino bones predate fossil dino eggs by over 100 million years? Wow. New studies of some of the earliest dino eggs shed light on egg evolution. https://www.google.com/amp/s/phys.org/news/2019-03-world-oldest-eggs-reveal-dinosaur.amp
Troodon posted a topic in Fossil NewsThis article used fossilized and modern eggs to look at constructing environment, ecology and biology over a range of time scales from deep time to the present. Cracking the egg: the use of modern and fossil eggs for ecological, environmental and biological interpretation Shaena Montanari Published 20 June 2018.DOI: 10.1098/rsos.180006 http://rsos.royalsocietypublishing.org/content/5/6/180006?platform=hootsuite
MarcoSr posted a topic in Fossil Hunting TripsWe get a lot of posts on TFF on eggs which mostly turn out to be geologic specimens. So I thought I would post a real Oligocene bird egg and some eggshells from my sons’ Nebraska ranch. The egg and eggshells are from the Scenic Member of the Brule Formation. Here is one of three complete bird eggs that my sons have found on the ranch in 2016 and 2017. This egg, found by my son Mel, is around 2 ½ inches long. I’ve found a large number of eggshell pieces in the anthill matrix that I’ve been taking from the ranch during the last two years. I’ve found eggshells in all 18 areas of the 360 acre ranch where I took anthill matrix. I was really surprised about how common the eggshells are throughout the ranch especially with the fact that I didn’t find bird bones. A good number of eggshell specimens from my September 2016 trip to the ranch have just been given to an eggshell researcher. I’m really looking forward to her opinions on them. I’ve been assuming that they are all bird eggshells. I again found a large number of eggshell specimens from anthill matrix from my May 2017 trip to the ranch. Below are close-up pictures of an individual eggshell specimen which is 5mm by 3 mm by 1mm thick. Outside of eggshell (note a good number of pieces have this pattern but there were a number of other distinctive patterns on the outside): Inside of eggshell (note the inside of all specimens pretty much looked like this): Cross section of eggshell (note the very thin white outer layer): Below are a number of eggshell specimens from my May 2017 trip. For size reference the gem jar cups are 1 ¾ inches in diameter. The specimens in each cup are from a different area of the ranch. Some eggshells have the outside of the eggshell face up and some have the inside of the eggshell face up. A few eggshells are missing that thin outer layer of eggshell. Note that there are several distinct patterns on the outer eggshells. Marco Sr.
We see lots of dinosaur eggs from Asia, occasional eggs from France and very spotty from the Two Medicine of Montana and Alberta. Lets not also forgot the tons of mimic ones. This month's SVP journal describes the first fossil egg and eggshells from the Hell Creek Formation. The paper states that despite over 100 years of intense exploration, the terrestrial rocks of the Hell Creek Formation are void of fossil eggs. The paper describes the first fossil egg and additional eggshell fragments from the Formation. The two-layered structure of the smooth 1600 µm thick eggshell of Belonoolithus garbani permits assignment of the 6 cm x 8 cm to theropoda. The material was found in Garfield County, Montana near the Fort Peck Reservoir Other eggshell material described in the paper are described in this table 1 Table 2 compares the egg or eggshell fragments distributed in Montana and Alberta Paper is to large to post... Reference: Journal of Vertebrate Paleontology Fossil egg and eggshells from the Upper Cretaceous Hell Creek Formation, Montana Frankie D. Jackson & David J. Varricchio