Re: [dinosaur] Dating of dinosaur age during history
Thomas Richard Holtz <[email protected]> Fri, 22 Nov 2019 12:58:21 -0500
| Newsgroups | gmane.science.dinosaurs.general |
|---|---|
| Message-ID | <CAHQFgpqsM-SkN0FXTFwuNG+SVq8EO2goBh2jd8KTgq8bghgdCw@mail.gmail.com> |
The book A Geologic Time Scale 2004 has charts showing the shifting of time units from Holmes' 1948 version to 2004, but unfortunately I don't see an online version of these figures. On Fri, Nov 22, 2019 at 12:51 PM Thomas Richard Holtz <[email protected]> wrote: > By the way, you did not post the latest! > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.stratigraphy.org_ICSchart_ChronostratChart2019-2D05.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=Ut40he5uXIL1XKPSgMzo3w62AeJ88ryA4rB4H3mJXgs&e= > > (just go to stratigraphy.org and click on Chart/Time Scale to get the > latest) > > On Fri, Nov 22, 2019 at 9:33 AM Robert Margulski <[email protected]> > wrote: > >> >> All, >> >> I having trouble posting right now, please forward to the list if you >> deem it proper. >> >> Table of age estimates? >> I would go with the IUGS chart at: >> >> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.stratigraphy.org_ICSchart_ChronostratChart2018-2D07.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=j6iqgAfUFuhVLYYQ39iNTLbgs1oALWsdRi1ZcZVboUo&e= >> >> >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.stratigraphy.org_ICSchart_ChronostratChart2018-2D07.pdf&d=DwMBAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=I072bzIUmWEtZfLh226FF48NyyVTHU3XQIY7v5PFWts&s=-9KgyOiuAS3Ub2nT19N9do3Azn0UBkFMIAgIuvteI3o&e=>How >> it has improved over time? >> I'd like to see that myself. >> >> Respectfully, >> Robert >> >> >> At 11:19 AM 11/21/2019, Merald Clark wrote: >> >> OMG Poekilopleuron, thank you! >> I've been wondering about this lately myself! >> Yours, >> Merald Clark >> >> On Wed, Nov 20, 2019 at 11:26 AM Poekilopleuron < >> [email protected]> wrote: >> Good day, >> >> I seem to recall that at the beginning of the 20th Century it was >> believed that Tyrannosaurus was only about 3 to 8 million years old (and >> Protoceratops about 13 million years after 1920). Is there any table of age >> estimates for dinosaurs and how it was improved during the time? E. g. how >> K-Pg boundary was dated from the 19th Century up to modern estimates of >> 66.0 mya. I have seen that around 1950 it was thought to be some 75 to 70 >> million years ago? Thank you in advance! Tom >> >> "Be faithful in small things, >> because it is in them that your strength lies." >> Mother Teresa >> > > > -- > > Thomas R. Holtz, Jr. > Email: [email protected] Phone: 301-405-4084 > Principal Lecturer, Vertebrate Paleontology > > Office: Geology 4106, 8000 Regents Dr., College Park MD 20742 > > Dept. of Geology, University of Maryland > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_-7Etholtz_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=QKd-L4wdYx2G1VzhT7d82Z-KWGwFeJaObGs8sW7ZTG4&e= > > Phone: 301-405-6965 > Fax: 301-314-9661 > > Faculty Director, Science & Global Change Program, College Park Scholars > > Office: Centreville 1216, 4243 Valley Dr., College Park MD 20742 > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_sgc&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=7ESaHRGCYmMZbSnIKS5ebpgpopC0xZ8qqPAXG2C4uI4&e= > Fax: 301-314-9843 > > Mailing Address: Thomas R. Holtz, Jr. > Department of Geology > Building 237, Room 1117 > > 8000 Regents Drive > University of Maryland > College Park, MD 20742-4211 USA > -- Thomas R. Holtz, Jr. Email: [email protected] Phone: 301-405-4084 Principal Lecturer, Vertebrate Paleontology Office: Geology 4106, 8000 Regents Dr., College Park MD 20742 Dept. of Geology, University of Maryland https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_-7Etholtz_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=QKd-L4wdYx2G1VzhT7d82Z-KWGwFeJaObGs8sW7ZTG4&e= Phone: 301-405-6965 Fax: 301-314-9661 Faculty Director, Science & Global Change Program, College Park Scholars Office: Centreville 1216, 4243 Valley Dr., College Park MD 20742 https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_sgc&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=7ESaHRGCYmMZbSnIKS5ebpgpopC0xZ8qqPAXG2C4uI4&e= Fax: 301-314-9843 Mailing Address: Thomas R. Holtz, Jr. Department of Geology Building 237, Room 1117 8000 Regents Drive University of Maryland College Park, MD 20742-4211 USA