Algonquian languages] as a group than among the Algonquian languages as a whole or among the non-Eastern languages." The validity of PEA as a genetic subgroup has been disputed by Pentland and Proulx. Pentland questions the Eastern Algonquian status of the southern New England languages and Powhatan and Carolina Algonquian. Proulx has proposed that the similarities can be explained as the result of diffusion. Goddard has countered that the extent of the similarities would require extensive diffusion very early in the breakup of the Eastern Algonquian languages and that such a position would be difficult in principle to differentiate from analyzing PEA as a genetic subgroup. Eastern Algonquian subgroupings Similarities among subsets of some of the Eastern Algonquian languages have led to several proposals for further subgroupings within Eastern Algonquian: Abenakian, Southern New England Algonquian (SNEA), and Delawaran, with the latter consisting of Mahican and Common Delaware, a further subgroup. The amount of evidence for each subgrouping varies, and the incomplete record for many parts of the Eastern Algonquian area makes interpretation of relations between the languages difficult. As well, diffusion means that some common features may have spread beyond their original starting point through contact, and as a result, a number of characteristics occur in a language assigned to a proposed subgroup, but the same feature is also found in other adjacent languages that are not analyzed as part of the subgroup in question. Appeal to both genetic subgroups and areal diffusion is required. Goddard notes: "Each Eastern Algonquian language shares features with each of its immediate neighbors, and the resulting continuum is of a sort that is likely to have resulted from the spread of linguistic innovations among forms of speech that were already partly differentiated but still similar enough to make partial bilingualism easy." Proceeding north to south, the languages of the Maritimes and New England are strongly differentiated from those farther south (Mahican, the Delaware languages, Nanticoke, Carolina Algonquian, and Powhatan). At the same time the Southern New England languages (discussed below) share significant similarities, indicating a closer degree of relationship between them. Micmac has innovated significantly relative to other Eastern Algonquian languages, particularly in terms of grammatical features, but it shares a number of phonological innovations and lexical features with Maliseet-Passamaquoddy and Eastern and Western Abenaki. Abenakian The proposed Abenakian subdivision comprises Eastern and Western Abenaki as well as Maliseet-Passamaquoddy; several phonological innovations are shared