The Miocene Pebas Formation from the section Santa Rosa de Pichana (Loreto, Peru) was investigated using a combination of analyses of sedimentary facies, molluscan communities and taphonomy, and stable isotopes of both entire shells and growth bands in bivalves. Three sequences, comprising a succession of transgressive, maximum flooding and regressive/prograding intervals, are documented. Molluscs are most common in the transgressive/highstand intervals and are almost absent in regressive/prograding intervals. The fauna is dominated by endemic Pebasian species, such as Pachydon and Dyris spp. The nature of the deposits as well as the availability of oxygen varied in a predictable way within each of the sequences and determined the nature of the assemblages. Highest diversity was reached in the late transgressive phase before the development of dysoxia that was widespreadhas enjoyed building relationships with his patients over the years.

Gilbert has previously been part of the Vocational Training scheme, helping to mentor many young dentists in their transition to general practice. He keeps up to date with modern techniques through regular training and course attendance and he has recently completed full training in the provision of Six month smiles and Inman aligner treatments.

Outside of work Gilbert enjoys all sports, particularly football and golf. He enjoys listening to music, attending concerts, relaxing with friends and trying to stay fit and healthy. He is married to Kay and has 4 children whom he thouroughly enjoys spending time.

Dr. Gareth Shepherd (BDS)

GDC No: 83367

Gareth graduated from Dundee University in 2004 and joined the Garioch dental Practice after leaving dental school. After 9