I currently have two graphs, but the data is densely clustered so I can not see the details of the Neoproterozoic.
(Please see attachments)
http://onlinelibrary.wiley.com/doi/10.1029/2001GC000266/full#figure-viewer-ggge202-fig-0001
Dear Rachelle,
Yes, there are a lot of curves (and vary a lot as Jorge wrote), but it is difficult to decide who is closer to the truth - see the review of the problem in American Journal of Science 315(4):275-316 DOI10.2475/04.2015.01.
Graham Shields later himself spread the δ13C curve for Neoproterozoic (Fig. 3): sp.lyellcollection.org/content/specpubgsl/448/1/161.full.pdf
A more detailed compilation (Fig. 4-13) is given in the thesis of Grant Cox: https://www.researchgate.net/publication/280603294_Chapter_4_A_Basalt_Weathering_Trigger_for_Snowball_Earth/figures?lo=1.
...Sometimes the best curve is the one that the members of the admissions committee like on defense, but it's probably not the best option!
Successful work
What I want to tell you is that the carbon and oxygen isotopes of the Cambrian in different regions are not the same. It is also different in the end of the Cambrian period and early.
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