Ammonoid Correlation & Time Charts

Architeuthoceras

Architeuthis
Staff member
Moderator
#1
This link will take you to the latest

Geologic Time Scale

from the International Union of Geologic Sciences (on NORGES site).

Devonian thru Cretaceous detailed charts (PDF files) show ammonoid zonation and correlation worldwide. You should be able to date all your fossil cephs to within a few million years :grin:
 

Phil

Colossal Squid
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Registered
#2
Thanks very much for this useful chart, Kevin. I've made it 'sticky' so it will remain at the top of the threads for reference along with some of the other resource-orientated threads.

Interesting that it now denotes 'Ediacaran' as a period in its own right in the Lower Cambrian as was determined last year.
 

um...

Architeuthis
Supporter
#3
This is fabulous, Kevin; I don't have anything close to this good in any of my books or bookmakred websites.

:notworth:
 

Architeuthoceras

Architeuthis
Staff member
Moderator
#4
Here are a few more. If, like me, you are used to seeing colors according to the USGS. :wink: Not as detailed as the first link.

Stratigraphy.org

select Time Scale Charts.

The time scale comparison charts are very interesting. Amazing to see how the geologic time scale has changed over the last century.

The Geowhen database is also very useful as not all papers conform to the new 2004 timescale, it helps correlate worldwide stages and some NW europe faunal stages.
 

OB

Colossal Squid
Staff member
Moderator
#7
spartacus said:
SPECTACULAR !

wtg big Kevin, all my others are now rendered obsolete & duff !

Keef

As in: see attached?
 

Phil

Colossal Squid
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Registered
#9
I can't see anything attached to your message, Fossilkid.

If you have found any ammonites you are most welcome to post images and details in the fossil forum.

Welcome too!:welcome:
 

fossilkid25

Blue Ring
Registered
#12
hey phil
thanks. plus just to let you know im only 16 years of age but i have soo much kowledge about fossils and geology u would be shocked by how much i know but thats what i have been told by paleontologists :) but i wont be big headed :)
 

fossilkid25

Blue Ring
Registered
#15
hey guys
i cant use a camera at the moment as i just come out of hospital after having an emergency operation on my hand so i am 1 handed at the moment. but i need an id for an ammonite i found in a cretaceous sediment rock. i only have 1 picture on my forum. i know i need permission before i put a link of my forum on anouther forum. so can i have permission to send a link to a post on my forum with the ammonite picture on please ?
 

OB

Colossal Squid
Staff member
Moderator
#16
To me, that doesn't sound like a problem whatsoever, no copyright issues with hyperlinking, Fossil Kid, unless you're hyperlinking to beyond a paid subscription type firewall. If you need "official" permission, than good ole' webmeister Tony will have to step in :grin:

He should be up in roughly 3 hours, I'd say...
 

OB

Colossal Squid
Staff member
Moderator
#18
It's the fact you've established it's Cretaceous, otherwise my initial guess would've been Psiloceras psilonotum, which alas is from the Hettangien...

A further clue might be found in the systematic account of the Ammonoidea in the 1966 Geol. Soc. Memoire on the Geology of the country around Canterbury and Folkestone

"Except for the Desmoceratid Beudanticeras, which is common in the mammillatum Zone and occurs frequently in the early beds of the Upper Gault, the "Leiostraca", or smooth ammonites are known only by a few chance finds of Hypophylloceras, Tetragonites, Pictetia, Desmoceras, Puzosia and Uhligella. These ammonites are thought to have preferred open waters and to have had their European centre of dispersal in the Mediterranean region."

The problem obviously being, that your picture is of a much more slender shell than any of the quoted species above...

Is your fossil much eroded? The posted picture is somewhat vague, so I can't make out very specific markings...
 

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