Turns out this pottery is from a regional pottery located on the Fleurieu Peninsula here in South Australia. The pieces with these designs appear to be from the 1980s or 90s.
The following bio is from Judiths Australian Pottery site HERE
Mark Pearse (1941- ) was born in Adelaide. He studied at the National Gallery of Victoria Art School, graduating in 1962 and continued his training in London and Rome through a travelling scholarship awarded in the same year. Since 1966, he has been a practicing potter, painter and sculptor, as well as teaching art at St Peter's College Preparatory School in Adelaide from 1969-75. In 1974, he and his wife Jill set up Pearse's Pottery in Uraidla in the Adelaide hills. In 1979, they bought a historic property, “Bungala”, in Yankalilla on the Fleurieu Peninsula and relocated the pottery there. Ceramic work made in partnership with Jill is impressed 'Pearce's Pottery Uraidla' or 'Pearce's Pottery Yankalilla'.
I also found this great little promo video on YouTube from Pearse's Pottery.....They produce some fantastic sculptures by the look of it too.