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Earth Temperature Timeline for Last 20,000 Years by xkcd Remember, don't "boop" the trilobites. Yours, Paul H.

Hello, I was doing a study on the T. rex and Nanotyrannus teeth specimens I had, and I wanted to compare them against a list of known T. rex teeth with measurement. The paper: Dental Morphology and Variation in Theropod Dinosaurs: Implications for the Taxonomic Identification of Isolated Teeth (JOSHUA B. SMITH, DAVID R. VANN, AND PETER DODSON) contains a list of 115 T. rex teeth. To make it easier to compare and read the data, I combined the measurements into a single chart, added colors and lines for ease of reading, and added the size and names of the T. rex used in the study Feel free to refer to the below chart for T. rex teeth measurements. I had to split the chart into 2 due to size limitations, but if you want the full-sized PDF version (25 MB), please message me so I can send it to you by email. If you have any suggestions to improve readability, or have your own data to add, go ahead and post it here! I will be posting pics and measurements of my various T. rex and Nanotyrannus teeth here @Troodon

Virtually every book on paleontology includes a picture or table on the geologic time scale of some sort. But have you ever noticed that virtually none of them is drawn in true proportions? As a result, many of us have no good, from the top of the head insight in the true propotions of the geologic periods and epochs. Who truly realizes that the Cretaceous for example, represents a larger time span than the whole of the Cenozoic? In any case, for a long time I did not, and the drawings I devoured as a kid did not really help me to grasp the true dimensions of each of the geological periods. Obviously, drawing such a chart poses quite some challenges in terms of layout. In 2015, admittedly a bit frustrated by the lack of such diagrams in literature (I might simply overlooked them), I made a first effort to overcome these challenges and draw a truly proportional infographic of the geologic timeline. It was published in a simplified form in a Belgian book on local geology. Still I kept finetuning it and adding some basic information and then it was resting on a digital shelf for over a year. Today I decided that was rather pointless, so I translated the infographic to English and shared it under the creative commons license for all to use: https://commons.wikimedia.org/wiki/File:Geologic_Time_Scale.png I hope it can be useful for educators. Feel free to provide me with feedback so I can further improve it. From the moment I'm completely satisfied with the infographic, I plan on releasing the original layered vector file, so everyone can use, edit, adapt and reshare the work in complete freedom.