Hello paleophilatelist
I will check if the miniature sheet with the old imprint is still available, however I can make no promises as although it is supposed to be definitive, neither the miniature sheets nor some of the stamps are available at the PO (since the rates rose to €0.20 (local) and €0.69 (local registered)last June, the €0.19 and €0.68 values are useless, and the lowest value readily available is €0.37).
I read the page on your website, and it is very good.

About your missing information:
Author: Edward Pirotta and Paul Psaila
Layout: You might include that the sheet was of 10 stamps
Paper: Maltese Cross watermarked
Print Technique: Offset
Quantity:
€0.01 - 1,600,000 (160,000 sheets)
- 29.12.09 - 400,000 stamps (40,000 sheets)
19.10.11 - 1,600,000 stamps (160,000 sheets)
miniature sheet - 11,500
- 29.12.09 - 7500 sheets
23.05.11 - 4000 sheets
You might include info on the reprints
(you can use my images as well if you wish) in the 'Variations' section.
Just for your information, Malta never issued any other stamps related to paleontology. However the
Scenery set of 16 September 2009 featured Reqqa Point (on the €0.02) and Xwejni Bay (on the €0.37), which are both good fossil sites on Malta's sister island of Gozo.