The THE TREATISE ON INVERTEBRATE PALEONTOLOGY
is probably the best source in what youre looking for. Its a 50 volume (and growing) set that has been compiled according to invertebrate orders . Its been a project of the Geological Society of America and hosted by the University of Kansas. Its been hosted on the internet by volume numbers and listed by invertebrate orders. It has (I believe) only been scanned and stuck in the cloud. I her that its going to be reorganized with sublinks to scholarly works that define the genera and species and with cross links to the geology.
Right now you sorta have to have a good idea how to use such "keys"
otherwise you could be searching through thousands and thousands of pages. However, if you can tell a coelenterate from a trilobite, and know that these two are NOT found in amber deposits or coal measures the rest is useful data and is easy to cross reference.(A good fossil hobbyist should be able to bust through the technical bullshit) and "whofound it first" crap.
There is also a similar treatise of fossil plants and vertebrates. (vertebrate paleo is not a universl tool to exploration geologists as is that of the invertebrates so Im not sure whether those volumes are even digitized yet.