Bits of pottery I found, an oyster shell and a melted piece of glass

[BeachHunter101]

Does anyone know the age of this pottery? and does anyone know the age of the piece of glass. I am trying to determine the age of the site I am on. Thanks in advance

[Humfrey]

Looks to me like 14th - 15th century gritty ware. Bits of shell and grit were tempered into it to bulk it up during this period

[Chef Geoff]

Shell tempered ware has been around as far back as the late iron age with an explosion in use around the late 2nd century though as Humfrey rightly says it was also common in the medieval period and is synonymous with hand built (local) pottery whereas your other sherds look to be wheel thrown and of a better manufacture with the larger pieces looking very "amphora" like and so could be Roman but all are nice and sharp so haven't been rolling around in plough soil very much,
The colour of the glass "could" be Roman though could equally be from a 1920's pop bottle Likewise the oyster shell isn't definitive in dating as although found on Roman sites oysters were the staple of the poor right in to the 19th century.
At the end of the day your local museum/archaeology group or FLO are the people to ask as they will know the fabric of local pottery and sherds are difficult if not impossible to id via photographs due to colour and texture playing such an important part

[Humfrey]

You are absolutely right Geoff the larger pieces are indeed Amphora looking.

[BeachHunter101]

Thank you for the brilliant information!  I'm going to take them to the museum. I really appreciate all the help   

[probono]

The top piece looks as if it is glazed - in which case it is 99% certain not to be roman - (Samian ware is not glazed - it is a slip)

Judging by how well it looks to have been made I would go with post-medieval