I want to know the answer to the following question:
What areas were being explored by others in  by sea faring vessels and when are they believed to have arrived  ?
All the background I'm provided with is that "The Dorian invasion was followed by a poorly attested period of migrations, appropriately called the Greek Dark Ages, but by 800 BC the landscape of Archaic and Classical Greece was discernible.". Is that enough to answer the question?
Answer: no