(24/08/2015) The CLAMP website has been redesigned and now incorporates new calibrations for online analysis.
New pages include those offering the PhysgAsia2 and PhysgGlobal378 calibration datasets. The online analysis pages also offer these calibrations but the PhysgGlobal378 dataset should really only be used for finding where your unknown (fossil) or test sites sit in global physiognomic space. Based on the position you can then determine which higher precision dataset (Physg3br. Physg3ar, PhysgAsia2) is best for your work. For recent papers about the PhysgAsia2 and PhysgGolobal378 data sets and their application see Khan et al., (2014) and Yang et al., (2015) respectively.
A new page offering images of modern leaves for scoring practice has been added.
(10/07/11) The scoresheets for 82 Paleoegene and Neogene assemblages have now been posted on the Fossil Sites page.
See Yang et al. (2011) for further details.
(09/07/11) New callibration datasets are now available for India.
These datasets, designated PhysgIndia1.xls and GRIDMetIndia1.xls comprise the Physg/GRIDMet3brc datasets with data from an additional 18 sites across india. To find out more about these new calibrations click here.
(28/12/10) New calibration datasets are now available for Asia.
These datasets, designated PhysgAsia1.xls and GRIDMetAsia1.xls comprise the Physg/GRIDMet3brc datasets with data from an additional 45 sites across Asia. To find out more about these new calibrations click here.
(04/10/10) A complete CLAMP analysis can now be carried out online with no need to purchase additional software!
Jian Yang of the Institute of Botany, Chinese Academy of Sciences, Beijing, working with Bob Spicer and Teresa Spicer, has developed an online analysis tool that performs not only an online Canonical Correspondence Analysis but also incorporates routines that perform the calibration regressions and calculate the predicted climate variables. While this renders the "classic" CLAMP analysis largely obsolete, the classic version is retained on this site because of its transparency. The use of the results spreadsheets is now no longer required in the online analysis, but inspecting the spreadsheets allows you to see the details of the calibration approach in an unambiguous way. Of course you can still follow the "classic" procedure and if you wish to do so click here. The online analysis replicates the approach used in the spreadsheets. To go straight to the pages explaining the online version of CLAMP analysis click here.
Jian Yang has also written a new scoresheet, Scoresheet_2010, that simplifies the task of scoring in that if a character is present you only need to enter a '1' on the scoresheet. All the scores are calculated automatically across the different characters states. Note that if you have missing data (as you often do with a fossil) you will recieve an error flag. You can ignore this if the data are genuinely absent.
The pages describing the leaf character definitions have been completely revised with illustrations of real leaves. To go straight to these revised pages click here.
There is now a new page describing in detail how to sample modern vegetation for calibration, testing or teaching purposes.
The Google Earth file (CLAMP_Sites.kmz) has been corrected for locational errors stemming from transcription errors dating back to the 1990's. We are now confident that no CLAMP samples will plot in the ocean!
All visible ranges of leaf form need to be sampled and to do this pole pruners or even catapaults are useful tools.