Re: [dinosaur] Dating of dinosaur age during history

Ben Creisler
[email protected]

There is a Google Books preview that shows the chart of the Mesozoic from
the 2004 book here:

https://urldefense.proofpoint.com/v2/url?u=https-3A__books.google.com_books-3Fid-3Drse4v1P-2Df9kC-26-26pg-3DRA1-2DPA13-26lpg-3DRA1-2DPA13-23v-3Donepage-26q-26f-3Dfalse&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=N34-EoR3VBSlaWoN-fnF0i89EiTMNUQy1yUhwSoZQIw&e= 



**
Compare to "Dinosaurs with Special Reference to the American Museum:
Collections" from 1915 that gives the end of the Cretaceous when
Tyrannosaurus lived as 3(!) million years ago:

https://urldefense.proofpoint.com/v2/url?u=https-3A__books.google.com_books-3Fid-3DAdvaAAAAMAAJ-26pg-3DRA1-2DPA11-26lpg-3DRA1-2DPA11-23-3Donepage-26q-26f-3Dfalse&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=njmH7U_QDZByJUkj6WdtxeYIN6l1eQleFlA0o_d_x6Y&e= 

On Fri, Nov 22, 2019 at 10:40 AM Thomas Richard Holtz <[email protected]>
wrote:

> 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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=8H7FXi8Q4Ign_9I4W1nyUW90GG7yKYf_0mAmxBWqPn0&e= 
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.stratigraphy.org_ICSchart_ChronostratChart2019-2D05.pdf&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=Ut40he5uXIL1XKPSgMzo3w62AeJ88ryA4rB4H3mJXgs&e=>
>>
>> (just go to stratigraphy.org
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__stratigraphy.org&d=DwMFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=CnLRE2vLUXrOfen5Y4EHeGmKEyp6SSxMMOet0iGjMzI&s=28NgKRqAyAgirX0ExM3PQ3-z_ur-MOjPxNV211aPzPk&e=>
>> 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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=FlolBfuqCtUqwc-4ArEmFR23vAQqrJ1mbSgHri_7aeM&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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=3iqaCMCYiE-F73CVlt5MZT3RoEVCMFRQ5f1Bfiv3gHc&e= 
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_-7Etholtz_&d=DwMFaQ&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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=Anq_goe31qMtylBosCk-6pPePXpWiGEahh3S0IzNaWc&e= 
>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_sgc&d=DwMFaQ&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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=3iqaCMCYiE-F73CVlt5MZT3RoEVCMFRQ5f1Bfiv3gHc&e= 
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_-7Etholtz_&d=DwMFaQ&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=yUW96Db7IQVcrI1HG2QmtNnNNorNx_wi4UFv6sO_Nik&s=Anq_goe31qMtylBosCk-6pPePXpWiGEahh3S0IzNaWc&e= 
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.geol.umd.edu_sgc&d=DwMFaQ&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
>