Here is a detail of a pen & ink drawing in progress. Actually, I think I will be doing some watercolor washes over it. It's going to be 6 x 15". The paper is L'antica Cartiera Tecniche Miste 140lb, cold pressed / grain fine. I generally prefer something with a bit more tooth for watercolor but this smoother paper is quite nice for pen and ink and I think it will work out ok with light washes.
In this detail you can see a coelacanth, a trilobite, and an ammonite.