I have been trying to find a dataset for the earth's long-term historical temperature record.
I have seen a few charts like this one from wikipedia.
Is there an open dataset with this information? If it exists, where can it be found?
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The Zachos et al. article has supplemental data section, but there are no actual datasets in this section, only sources for ΔO-18 and ΔC-13 isotopic data. The article itself says that the temperature estimates are given for an ice-free world ocean. If you want to cite the data from Figure 2 in the article without all the caveats (and then some) of the original, your readers will be either fooled or offended.
A sample caveat from the supplement:
Sampling Biases: One of the limitations on reconstructing long-term secular variations is the highly uneven distribution of deep-sea stable isotope data in both space and in time. The global signal for some key intervals is based on data from just a few records (emphasis mine - DH). In general, these spatial biases increase with age, moving toward the Atlantic, and shallower water depths. In other words, the Pacific, and abyssal portions of the oceans tend to be under-represented in existing stable isotope records. These biases do not pose a problem for our temperature/ice-volume reconstruction of the late Neogene oceans which were thermally homogeneous. Such biases, however, are a concern for establishing the mean climate-state of some "warmer" time intervals when the thermal gradients within the deep-sea were greater.