For some reason, my answer a few minutes ago was missing the subject line. In order to avoid confusion, I am re-sending it with the subject header. Sorry for this.

Am Fr., 3. Apr. 2020 um 09:50 Uhr schrieb Rasser, Michael W. <michael.rasser@smns-bw.de>:

Dear Laura, below are my comments on this:

1) How are Earth Science Collections curated and organized? I said
mainly defined by taxonomy, geographical origin, Storage and
Stratigraphic age (based on the Synthesys classifications) Are there any
more?

I agree with Jiri that this is enough!

Just to give a comparison with Andreas' list, our collections are organised and curated not only by systematic, but they cover all of the keywords above:

Level 1:

Amber

Amphibians, Fishes, Reptiles

Palaeobotany

Paleozoic and Triassic Invertebrates

Jurassic and Cretaceous Invertebrates

Tertiary and Quaternary Invertebates

Quaternary mammals

Tertiary mammals

Level 2:

Each collection is then organised by locality, stratigraphy, systematics, or a mixture of them, resp.

2) What is the minimum information that would be required in World
collections catalogue for the discoverability of Earth Science
collections and for a research to locate particular collections of
interest.

Not sure, if you mean discoverability of the collection itself, or of the museums objects that are housed in the respective collection. I assume that you mean discoverability of the objects:

Taxon name (no higher taxon name needed)

Repository number

Stratigraphy

Geography

Housing institution

Curator / contact address

3) What descriptive information should be considered mandatory or
desirable for each Collection?

Name and address of institution

Responsible curator / contact person

Stratigraphic focus

Systematic focus

Geographic focus

All the best and stay healthy!

Michael